id	sid	tid	token	lemma	pos
1844	1	1	A	a	DT
1844	1	2	File	File	NNP
1844	1	3	Storage	Storage	NNP
1844	1	4	Service	Service	NNP
1844	1	5	on	on	IN
1844	1	6	a	a	DT
1844	1	7	Cloud	Cloud	NNP
1844	1	8	Computing	Computing	NNP
1844	1	9	Environment	Environment	NNP
1844	1	10	for	for	IN
1844	1	11	Digital	Digital	NNP
1844	1	12	Libraries	Libraries	NNPS
1844	1	13	Victor	Victor	NNP
1844	1	14	Jesús	Jesús	NNP
1844	1	15	Sosa	Sosa	NNP
1844	1	16	-	-	HYPH
1844	1	17	Sosa	Sosa	NNP
1844	1	18	and	and	CC
1844	1	19	Emigdio	Emigdio	NNP
1844	1	20	M.	M.	NNP
1844	1	21	Hernandez	Hernandez	NNP
1844	1	22	-	-	HYPH
1844	1	23	Ramirez	Ramirez	NNP
1844	1	24	INFORMATION	INFORMATION	NNP
1844	1	25	TECHNOLOGY	TECHNOLOGY	NNP
1844	1	26	AND	and	CC
1844	1	27	LIBRARIES	LIBRARIES	NNP
1844	1	28	|	|	NNP
1844	1	29	DECEMBER	DECEMBER	NNP
1844	1	30	2012	2012	CD
1844	1	31	34	34	CD
1844	1	32	ABSTRACT	ABSTRACT	NNP
1844	1	33	The	the	DT
1844	1	34	growing	grow	VBG
1844	1	35	need	need	NN
1844	1	36	for	for	IN
1844	1	37	digital	digital	JJ
1844	1	38	libraries	library	NNS
1844	1	39	to	to	TO
1844	1	40	manage	manage	VB
1844	1	41	large	large	JJ
1844	1	42	amounts	amount	NNS
1844	1	43	of	of	IN
1844	1	44	data	datum	NNS
1844	1	45	requires	require	VBZ
1844	1	46	storage	storage	NN
1844	1	47	infrastructure	infrastructure	NN
1844	1	48	that	that	WDT
1844	1	49	libraries	library	NNS
1844	1	50	can	can	MD
1844	1	51	deploy	deploy	VB
1844	1	52	quickly	quickly	RB
1844	1	53	and	and	CC
1844	1	54	economically	economically	RB
1844	1	55	.	.	.
1844	2	1	Cloud	cloud	JJ
1844	2	2	computing	computing	NN
1844	2	3	is	be	VBZ
1844	2	4	a	a	DT
1844	2	5	new	new	JJ
1844	2	6	model	model	NN
1844	2	7	that	that	WDT
1844	2	8	allows	allow	VBZ
1844	2	9	the	the	DT
1844	2	10	provision	provision	NN
1844	2	11	of	of	IN
1844	2	12	information	information	NN
1844	2	13	technology	technology	NN
1844	2	14	(	(	-LRB-
1844	2	15	IT	it	NN
1844	2	16	)	)	-RRB-
1844	2	17	resources	resource	NNS
1844	2	18	on	on	IN
1844	2	19	demand	demand	NN
1844	2	20	,	,	,
1844	2	21	lowering	lower	VBG
1844	2	22	management	management	NN
1844	2	23	complexity	complexity	NN
1844	2	24	.	.	.
1844	3	1	This	this	DT
1844	3	2	paper	paper	NN
1844	3	3	introduces	introduce	VBZ
1844	3	4	a	a	DT
1844	3	5	file	file	NN
1844	3	6	-	-	HYPH
1844	3	7	storage	storage	NN
1844	3	8	service	service	NN
1844	3	9	that	that	WDT
1844	3	10	is	be	VBZ
1844	3	11	implemented	implement	VBN
1844	3	12	on	on	IN
1844	3	13	a	a	DT
1844	3	14	private	private	JJ
1844	3	15	/	/	SYM
1844	3	16	hybrid	hybrid	JJ
1844	3	17	cloud	cloud	NN
1844	3	18	-	-	HYPH
1844	3	19	computing	computing	NN
1844	3	20	environment	environment	NN
1844	3	21	and	and	CC
1844	3	22	is	be	VBZ
1844	3	23	based	base	VBN
1844	3	24	on	on	IN
1844	3	25	open	open	JJ
1844	3	26	-	-	HYPH
1844	3	27	source	source	NN
1844	3	28	software	software	NN
1844	3	29	.	.	.
1844	4	1	The	the	DT
1844	4	2	authors	author	NNS
1844	4	3	evaluated	evaluate	VBD
1844	4	4	performance	performance	NN
1844	4	5	and	and	CC
1844	4	6	resource	resource	NN
1844	4	7	consumption	consumption	NN
1844	4	8	using	use	VBG
1844	4	9	several	several	JJ
1844	4	10	levels	level	NNS
1844	4	11	of	of	IN
1844	4	12	data	datum	NNS
1844	4	13	availability	availability	NN
1844	4	14	and	and	CC
1844	4	15	fault	fault	NN
1844	4	16	tolerance	tolerance	NN
1844	4	17	.	.	.
1844	5	1	This	this	DT
1844	5	2	service	service	NN
1844	5	3	can	can	MD
1844	5	4	be	be	VB
1844	5	5	taken	take	VBN
1844	5	6	as	as	IN
1844	5	7	a	a	DT
1844	5	8	reference	reference	NN
1844	5	9	guide	guide	NN
1844	5	10	for	for	IN
1844	5	11	IT	IT	NNP
1844	5	12	staff	staff	NN
1844	5	13	wanting	want	VBG
1844	5	14	to	to	TO
1844	5	15	build	build	VB
1844	5	16	a	a	DT
1844	5	17	modest	modest	JJ
1844	5	18	cloud	cloud	NN
1844	5	19	storage	storage	NN
1844	5	20	infrastructure	infrastructure	NN
1844	5	21	.	.	.
1844	6	1	INTRODUCTION	introduction	VB
1844	6	2	The	the	DT
1844	6	3	information	information	NN
1844	6	4	technology	technology	NN
1844	6	5	(	(	-LRB-
1844	6	6	IT	it	NN
1844	6	7	)	)	-RRB-
1844	6	8	revolution	revolution	NN
1844	6	9	has	have	VBZ
1844	6	10	led	lead	VBN
1844	6	11	to	to	IN
1844	6	12	the	the	DT
1844	6	13	digitization	digitization	NN
1844	6	14	of	of	IN
1844	6	15	every	every	DT
1844	6	16	kind	kind	NN
1844	6	17	of	of	IN
1844	6	18	information.1	information.1	CD
1844	6	19	Digital	digital	JJ
1844	6	20	libraries	library	NNS
1844	6	21	are	be	VBP
1844	6	22	appearing	appear	VBG
1844	6	23	as	as	IN
1844	6	24	one	one	CD
1844	6	25	more	more	JJR
1844	6	26	step	step	NN
1844	6	27	toward	toward	IN
1844	6	28	easy	easy	JJ
1844	6	29	access	access	NN
1844	6	30	to	to	IN
1844	6	31	information	information	NN
1844	6	32	spread	spread	VBD
1844	6	33	throughout	throughout	IN
1844	6	34	a	a	DT
1844	6	35	variety	variety	NN
1844	6	36	of	of	IN
1844	6	37	media	medium	NNS
1844	6	38	.	.	.
1844	7	1	The	the	DT
1844	7	2	digital	digital	JJ
1844	7	3	storage	storage	NN
1844	7	4	of	of	IN
1844	7	5	data	datum	NNS
1844	7	6	facilitates	facilitate	VBZ
1844	7	7	information	information	NN
1844	7	8	retrieval	retrieval	NN
1844	7	9	,	,	,
1844	7	10	allowing	allow	VBG
1844	7	11	a	a	DT
1844	7	12	new	new	JJ
1844	7	13	wave	wave	NN
1844	7	14	of	of	IN
1844	7	15	services	service	NNS
1844	7	16	and	and	CC
1844	7	17	web	web	NN
1844	7	18	applications	application	NNS
1844	7	19	that	that	WDT
1844	7	20	take	take	VBP
1844	7	21	advantage	advantage	NN
1844	7	22	of	of	IN
1844	7	23	the	the	DT
1844	7	24	huge	huge	JJ
1844	7	25	amount	amount	NN
1844	7	26	of	of	IN
1844	7	27	data	datum	NNS
1844	7	28	available.2	available.2	CD
1844	7	29	The	the	DT
1844	7	30	challenges	challenge	NNS
1844	7	31	of	of	IN
1844	7	32	preserving	preserve	VBG
1844	7	33	and	and	CC
1844	7	34	sharing	share	VBG
1844	7	35	data	datum	NNS
1844	7	36	stored	store	VBN
1844	7	37	on	on	IN
1844	7	38	digital	digital	JJ
1844	7	39	media	medium	NNS
1844	7	40	are	be	VBP
1844	7	41	significant	significant	JJ
1844	7	42	compared	compare	VBN
1844	7	43	to	to	IN
1844	7	44	the	the	DT
1844	7	45	print	print	NN
1844	7	46	world	world	NN
1844	7	47	,	,	,
1844	7	48	in	in	IN
1844	7	49	which	which	WDT
1844	7	50	data	datum	NNS
1844	7	51	“	"	``
1844	7	52	stored	store	VBD
1844	7	53	”	"	''
1844	7	54	on	on	IN
1844	7	55	paper	paper	NN
1844	7	56	can	can	MD
1844	7	57	still	still	RB
1844	7	58	be	be	VB
1844	7	59	read	read	VBN
1844	7	60	centuries	century	NNS
1844	7	61	or	or	CC
1844	7	62	millennia	millennia	NN
1844	7	63	later	later	RB
1844	7	64	.	.	.
1844	8	1	In	in	IN
1844	8	2	contrast	contrast	NN
1844	8	3	,	,	,
1844	8	4	only	only	RB
1844	8	5	ten	ten	CD
1844	8	6	years	year	NNS
1844	8	7	ago	ago	RB
1844	8	8	,	,	,
1844	8	9	floppy	floppy	JJ
1844	8	10	disks	disk	NNS
1844	8	11	were	be	VBD
1844	8	12	a	a	DT
1844	8	13	major	major	JJ
1844	8	14	storage	storage	NN
1844	8	15	medium	medium	NN
1844	8	16	for	for	IN
1844	8	17	digital	digital	JJ
1844	8	18	data	datum	NNS
1844	8	19	,	,	,
1844	8	20	but	but	CC
1844	8	21	now	now	RB
1844	8	22	the	the	DT
1844	8	23	vast	vast	JJ
1844	8	24	majority	majority	NN
1844	8	25	of	of	IN
1844	8	26	computers	computer	NNS
1844	8	27	no	no	RB
1844	8	28	longer	longer	RB
1844	8	29	support	support	VBP
1844	8	30	this	this	DT
1844	8	31	type	type	NN
1844	8	32	of	of	IN
1844	8	33	device	device	NN
1844	8	34	.	.	.
1844	9	1	In	in	IN
1844	9	2	today	today	NN
1844	9	3	’s	’s	POS
1844	9	4	environment	environment	NN
1844	9	5	,	,	,
1844	9	6	selecting	select	VBG
1844	9	7	a	a	DT
1844	9	8	good	good	JJ
1844	9	9	data	data	NN
1844	9	10	repository	repository	NN
1844	9	11	is	be	VBZ
1844	9	12	important	important	JJ
1844	9	13	to	to	TO
1844	9	14	ensure	ensure	VB
1844	9	15	that	that	IN
1844	9	16	data	datum	NNS
1844	9	17	are	be	VBP
1844	9	18	preserved	preserve	VBN
1844	9	19	and	and	CC
1844	9	20	accessible	accessible	JJ
1844	9	21	.	.	.
1844	10	1	Likewise	likewise	RB
1844	10	2	,	,	,
1844	10	3	defining	define	VBG
1844	10	4	the	the	DT
1844	10	5	storage	storage	NN
1844	10	6	requirements	requirement	NNS
1844	10	7	for	for	IN
1844	10	8	digital	digital	JJ
1844	10	9	libraries	library	NNS
1844	10	10	has	have	VBZ
1844	10	11	become	become	VBN
1844	10	12	a	a	DT
1844	10	13	big	big	JJ
1844	10	14	challenge	challenge	NN
1844	10	15	.	.	.
1844	11	1	In	in	IN
1844	11	2	this	this	DT
1844	11	3	context	context	NN
1844	11	4	,	,	,
1844	11	5	IT	IT	NNP
1844	11	6	staff	staff	NN
1844	11	7	—	—	:
1844	11	8	those	those	DT
1844	11	9	responsible	responsible	JJ
1844	11	10	for	for	IN
1844	11	11	predicting	predict	VBG
1844	11	12	what	what	WDT
1844	11	13	storage	storage	NN
1844	11	14	resources	resource	NNS
1844	11	15	will	will	MD
1844	11	16	be	be	VB
1844	11	17	needed	need	VBN
1844	11	18	in	in	IN
1844	11	19	the	the	DT
1844	11	20	medium	medium	JJ
1844	11	21	term	term	NN
1844	11	22	—	—	:
1844	11	23	often	often	RB
1844	11	24	face	face	VBP
1844	11	25	the	the	DT
1844	11	26	following	follow	VBG
1844	11	27	scenarios	scenario	NNS
1844	11	28	:	:	:
1844	11	29	•	•	NNP
1844	11	30	Prediction	prediction	NN
1844	11	31	of	of	IN
1844	11	32	storage	storage	NN
1844	11	33	requirements	requirement	NNS
1844	11	34	turn	turn	VBP
1844	11	35	out	out	RP
1844	11	36	to	to	TO
1844	11	37	be	be	VB
1844	11	38	below	below	IN
1844	11	39	real	real	JJ
1844	11	40	needs	need	NNS
1844	11	41	,	,	,
1844	11	42	resulting	result	VBG
1844	11	43	in	in	IN
1844	11	44	resource	resource	NN
1844	11	45	deficits	deficit	NNS
1844	11	46	.	.	.
1844	12	1	•	•	NNP
1844	12	2	Prediction	prediction	NN
1844	12	3	of	of	IN
1844	12	4	storage	storage	NN
1844	12	5	requirements	requirement	NNS
1844	12	6	turn	turn	VBP
1844	12	7	out	out	RP
1844	12	8	to	to	TO
1844	12	9	be	be	VB
1844	12	10	above	above	IN
1844	12	11	real	real	JJ
1844	12	12	needs	need	NNS
1844	12	13	,	,	,
1844	12	14	resulting	result	VBG
1844	12	15	in	in	IN
1844	12	16	expenditure	expenditure	NN
1844	12	17	and	and	CC
1844	12	18	administration	administration	NN
1844	12	19	overhead	overhead	NN
1844	12	20	for	for	IN
1844	12	21	resources	resource	NNS
1844	12	22	that	that	WDT
1844	12	23	end	end	VBP
1844	12	24	up	up	RP
1844	12	25	not	not	RB
1844	12	26	being	be	VBG
1844	12	27	used	use	VBN
1844	12	28	.	.	.
1844	13	1	In	in	IN
1844	13	2	these	these	DT
1844	13	3	situations	situation	NNS
1844	13	4	,	,	,
1844	13	5	considering	consider	VBG
1844	13	6	only	only	RB
1844	13	7	an	an	DT
1844	13	8	efficient	efficient	JJ
1844	13	9	strategy	strategy	NN
1844	13	10	to	to	TO
1844	13	11	store	store	VB
1844	13	12	documents	document	NNS
1844	13	13	is	be	VBZ
1844	13	14	not	not	RB
1844	13	15	enough.3	enough.3	CD
1844	13	16	The	the	DT
1844	13	17	acquisition	acquisition	NN
1844	13	18	of	of	IN
1844	13	19	storage	storage	NN
1844	13	20	services	service	NNS
1844	13	21	that	that	WDT
1844	13	22	implement	implement	VBP
1844	13	23	an	an	DT
1844	13	24	elastic	elastic	JJ
1844	13	25	concept	concept	NN
1844	13	26	(	(	-LRB-
1844	13	27	i.e.	i.e.	FW
1844	13	28	,	,	,
1844	13	29	storage	storage	NN
1844	13	30	capacity	capacity	NN
1844	13	31	that	that	WDT
1844	13	32	can	can	MD
1844	13	33	be	be	VB
1844	13	34	Victor	Victor	NNP
1844	13	35	Jesús	Jesús	NNP
1844	13	36	Sosa	Sosa	NNP
1844	13	37	-	-	HYPH
1844	13	38	Sosa	Sosa	NNP
1844	13	39	(	(	-LRB-
1844	13	40	vjsosa@tamps.cinvestav.mx	vjsosa@tamps.cinvestav.mx	NNP
1844	13	41	)	)	-RRB-
1844	13	42	is	be	VBZ
1844	13	43	Professor	Professor	NNP
1844	13	44	and	and	CC
1844	13	45	Researcher	Researcher	NNP
1844	13	46	at	at	IN
1844	13	47	the	the	DT
1844	13	48	Information	Information	NNP
1844	13	49	Technology	Technology	NNP
1844	13	50	Laboratory	Laboratory	NNP
1844	13	51	at	at	IN
1844	13	52	CINVESTAV	CINVESTAV	NNP
1844	13	53	,	,	,
1844	13	54	Campus	Campus	NNP
1844	13	55	Tamaulipas	Tamaulipas	NNP
1844	13	56	,	,	,
1844	13	57	Mexico	Mexico	NNP
1844	13	58	.	.	.
1844	14	1	Emigdio	Emigdio	NNP
1844	14	2	M.	M.	NNP
1844	14	3	Hernandez	Hernandez	NNP
1844	14	4	-	-	HYPH
1844	14	5	Ramirez	Ramirez	NNP
1844	14	6	(	(	-LRB-
1844	14	7	emhr1983@gmail.com	emhr1983@gmail.com	NNP
1844	14	8	)	)	-RRB-
1844	14	9	is	be	VBZ
1844	14	10	Software	Software	NNP
1844	14	11	Developer	Developer	NNP
1844	14	12	,	,	,
1844	14	13	SVAM	SVAM	NNP
1844	14	14	International	International	NNP
1844	14	15	,	,	,
1844	14	16	Ciudad	Ciudad	NNP
1844	14	17	Victoria	Victoria	NNP
1844	14	18	,	,	,
1844	14	19	Mexico	Mexico	NNP
1844	14	20	.	.	.
1844	15	1	INFORMATION	INFORMATION	NNP
1844	15	2	TECHNOLOGY	TECHNOLOGY	NNP
1844	15	3	AND	and	CC
1844	15	4	LIBRARIES	library	NNS
1844	15	5	|	|	NNP
1844	15	6	DECEMBER	DECEMBER	NNP
1844	15	7	2012	2012	CD
1844	15	8	35	35	CD
1844	15	9	increased	increase	VBD
1844	15	10	or	or	CC
1844	15	11	reduced	reduce	VBN
1844	15	12	on	on	IN
1844	15	13	demand	demand	NN
1844	15	14	,	,	,
1844	15	15	with	with	IN
1844	15	16	a	a	DT
1844	15	17	cost	cost	NN
1844	15	18	of	of	IN
1844	15	19	acquisition	acquisition	NN
1844	15	20	and	and	CC
1844	15	21	management	management	NN
1844	15	22	relatively	relatively	RB
1844	15	23	low	low	JJ
1844	15	24	)	)	-RRB-
1844	15	25	becomes	become	VBZ
1844	15	26	attractive	attractive	JJ
1844	15	27	.	.	.
1844	16	1	Cloud	cloud	JJ
1844	16	2	computing	computing	NN
1844	16	3	is	be	VBZ
1844	16	4	a	a	DT
1844	16	5	current	current	JJ
1844	16	6	trend	trend	NN
1844	16	7	that	that	WDT
1844	16	8	considers	consider	VBZ
1844	16	9	the	the	DT
1844	16	10	Internet	internet	NN
1844	16	11	as	as	IN
1844	16	12	a	a	DT
1844	16	13	platform	platform	NN
1844	16	14	providing	provide	VBG
1844	16	15	on	on	IN
1844	16	16	-	-	HYPH
1844	16	17	demand	demand	NN
1844	16	18	computing	computing	NN
1844	16	19	and	and	CC
1844	16	20	software	software	NN
1844	16	21	as	as	IN
1844	16	22	a	a	DT
1844	16	23	service	service	NN
1844	16	24	to	to	IN
1844	16	25	anyone	anyone	NN
1844	16	26	,	,	,
1844	16	27	anywhere	anywhere	RB
1844	16	28	,	,	,
1844	16	29	and	and	CC
1844	16	30	at	at	IN
1844	16	31	any	any	DT
1844	16	32	time	time	NN
1844	16	33	.	.	.
1844	17	1	Digital	digital	JJ
1844	17	2	libraries	library	NNS
1844	17	3	naturally	naturally	RB
1844	17	4	should	should	MD
1844	17	5	be	be	VB
1844	17	6	connected	connect	VBN
1844	17	7	to	to	IN
1844	17	8	cloud	cloud	NN
1844	17	9	computing	compute	VBG
1844	17	10	to	to	TO
1844	17	11	obtain	obtain	VB
1844	17	12	mutual	mutual	JJ
1844	17	13	benefits	benefit	NNS
1844	17	14	and	and	CC
1844	17	15	enhance	enhance	VB
1844	17	16	both	both	DT
1844	17	17	perspectives.4	perspectives.4	CC
1844	17	18	In	in	IN
1844	17	19	this	this	DT
1844	17	20	model	model	NN
1844	17	21	,	,	,
1844	17	22	storage	storage	NN
1844	17	23	resources	resource	NNS
1844	17	24	are	be	VBP
1844	17	25	provisioned	provision	VBN
1844	17	26	on	on	IN
1844	17	27	demand	demand	NN
1844	17	28	and	and	CC
1844	17	29	are	be	VBP
1844	17	30	paid	pay	VBN
1844	17	31	according	accord	VBG
1844	17	32	to	to	IN
1844	17	33	consumption	consumption	NN
1844	17	34	.	.	.
1844	18	1	Services	service	NNS
1844	18	2	deployment	deployment	NN
1844	18	3	in	in	IN
1844	18	4	a	a	DT
1844	18	5	cloud	cloud	NN
1844	18	6	-	-	HYPH
1844	18	7	computing	computing	NN
1844	18	8	environment	environment	NN
1844	18	9	can	can	MD
1844	18	10	be	be	VB
1844	18	11	implemented	implement	VBN
1844	18	12	three	three	CD
1844	18	13	ways	way	NNS
1844	18	14	:	:	:
1844	18	15	private	private	JJ
1844	18	16	,	,	,
1844	18	17	public	public	JJ
1844	18	18	,	,	,
1844	18	19	or	or	CC
1844	18	20	hybrid	hybrid	JJ
1844	18	21	.	.	.
1844	19	1	In	in	IN
1844	19	2	the	the	DT
1844	19	3	private	private	JJ
1844	19	4	option	option	NN
1844	19	5	,	,	,
1844	19	6	infrastructure	infrastructure	NN
1844	19	7	is	be	VBZ
1844	19	8	operated	operate	VBN
1844	19	9	solely	solely	RB
1844	19	10	for	for	IN
1844	19	11	a	a	DT
1844	19	12	single	single	JJ
1844	19	13	organization	organization	NN
1844	19	14	;	;	:
1844	19	15	most	most	JJS
1844	19	16	of	of	IN
1844	19	17	the	the	DT
1844	19	18	time	time	NN
1844	19	19	,	,	,
1844	19	20	it	-PRON-	PRP
1844	19	21	requires	require	VBZ
1844	19	22	an	an	DT
1844	19	23	initial	initial	JJ
1844	19	24	strong	strong	JJ
1844	19	25	investment	investment	NN
1844	19	26	because	because	IN
1844	19	27	the	the	DT
1844	19	28	organization	organization	NN
1844	19	29	must	must	MD
1844	19	30	purchase	purchase	VB
1844	19	31	a	a	DT
1844	19	32	large	large	JJ
1844	19	33	amount	amount	NN
1844	19	34	of	of	IN
1844	19	35	storage	storage	NN
1844	19	36	resources	resource	NNS
1844	19	37	and	and	CC
1844	19	38	pay	pay	VB
1844	19	39	for	for	IN
1844	19	40	the	the	DT
1844	19	41	administration	administration	NN
1844	19	42	costs	cost	NNS
1844	19	43	.	.	.
1844	20	1	The	the	DT
1844	20	2	public	public	JJ
1844	20	3	cloud	cloud	NN
1844	20	4	is	be	VBZ
1844	20	5	the	the	DT
1844	20	6	most	most	RBS
1844	20	7	traditional	traditional	JJ
1844	20	8	version	version	NN
1844	20	9	of	of	IN
1844	20	10	cloud	cloud	NN
1844	20	11	computing	computing	NN
1844	20	12	.	.	.
1844	21	1	In	in	IN
1844	21	2	this	this	DT
1844	21	3	model	model	NN
1844	21	4	,	,	,
1844	21	5	infrastructure	infrastructure	NN
1844	21	6	belongs	belong	VBZ
1844	21	7	to	to	IN
1844	21	8	an	an	DT
1844	21	9	external	external	JJ
1844	21	10	organization	organization	NN
1844	21	11	where	where	WRB
1844	21	12	costs	cost	NNS
1844	21	13	are	be	VBP
1844	21	14	a	a	DT
1844	21	15	function	function	NN
1844	21	16	of	of	IN
1844	21	17	the	the	DT
1844	21	18	resources	resource	NNS
1844	21	19	used	use	VBN
1844	21	20	.	.	.
1844	22	1	These	these	DT
1844	22	2	costs	cost	NNS
1844	22	3	include	include	VBP
1844	22	4	administration	administration	NN
1844	22	5	.	.	.
1844	23	1	Finally	finally	RB
1844	23	2	,	,	,
1844	23	3	the	the	DT
1844	23	4	hybrid	hybrid	JJ
1844	23	5	model	model	NN
1844	23	6	contains	contain	VBZ
1844	23	7	a	a	DT
1844	23	8	mixture	mixture	NN
1844	23	9	of	of	IN
1844	23	10	private	private	JJ
1844	23	11	and	and	CC
1844	23	12	public	public	JJ
1844	23	13	.	.	.
1844	24	1	A	a	DT
1844	24	2	cloud	cloud	NN
1844	24	3	-	-	HYPH
1844	24	4	computing	computing	NN
1844	24	5	environment	environment	NN
1844	24	6	is	be	VBZ
1844	24	7	mainly	mainly	RB
1844	24	8	supported	support	VBN
1844	24	9	by	by	IN
1844	24	10	technologies	technology	NNS
1844	24	11	such	such	JJ
1844	24	12	as	as	IN
1844	24	13	virtualization	virtualization	NN
1844	24	14	and	and	CC
1844	24	15	service	service	NN
1844	24	16	-	-	HYPH
1844	24	17	oriented	orient	VBN
1844	24	18	architectures	architecture	NNS
1844	24	19	.	.	.
1844	25	1	A	a	DT
1844	25	2	cloud	cloud	NN
1844	25	3	environment	environment	NN
1844	25	4	provides	provide	VBZ
1844	25	5	omnipresence	omnipresence	NN
1844	25	6	and	and	CC
1844	25	7	facilitates	facilitate	VBZ
1844	25	8	deployment	deployment	NN
1844	25	9	of	of	IN
1844	25	10	file	file	NN
1844	25	11	-	-	HYPH
1844	25	12	storage	storage	NN
1844	25	13	services	service	NNS
1844	25	14	.	.	.
1844	26	1	It	-PRON-	PRP
1844	26	2	means	mean	VBZ
1844	26	3	that	that	IN
1844	26	4	users	user	NNS
1844	26	5	can	can	MD
1844	26	6	access	access	VB
1844	26	7	their	-PRON-	PRP$
1844	26	8	files	file	NNS
1844	26	9	via	via	IN
1844	26	10	the	the	DT
1844	26	11	Internet	internet	NN
1844	26	12	from	from	IN
1844	26	13	anywhere	anywhere	RB
1844	26	14	and	and	CC
1844	26	15	without	without	IN
1844	26	16	requiring	require	VBG
1844	26	17	the	the	DT
1844	26	18	installation	installation	NN
1844	26	19	of	of	IN
1844	26	20	a	a	DT
1844	26	21	special	special	JJ
1844	26	22	application	application	NN
1844	26	23	.	.	.
1844	27	1	The	the	DT
1844	27	2	user	user	NN
1844	27	3	only	only	RB
1844	27	4	needs	need	VBZ
1844	27	5	a	a	DT
1844	27	6	web	web	NN
1844	27	7	browser	browser	NN
1844	27	8	.	.	.
1844	28	1	Data	datum	NNS
1844	28	2	availability	availability	NN
1844	28	3	,	,	,
1844	28	4	scalability	scalability	NN
1844	28	5	,	,	,
1844	28	6	elastic	elastic	JJ
1844	28	7	service	service	NN
1844	28	8	,	,	,
1844	28	9	and	and	CC
1844	28	10	pay	pay	VB
1844	28	11	-	-	HYPH
1844	28	12	per	per	IN
1844	28	13	-	-	HYPH
1844	28	14	use	use	NN
1844	28	15	are	be	VBP
1844	28	16	attractive	attractive	JJ
1844	28	17	characteristics	characteristic	NNS
1844	28	18	found	find	VBN
1844	28	19	in	in	IN
1844	28	20	the	the	DT
1844	28	21	cloud	cloud	NNP
1844	28	22	service	service	NN
1844	28	23	model	model	NN
1844	28	24	.	.	.
1844	29	1	Virtualization	virtualization	NN
1844	29	2	plays	play	VBZ
1844	29	3	an	an	DT
1844	29	4	important	important	JJ
1844	29	5	role	role	NN
1844	29	6	in	in	IN
1844	29	7	cloud	cloud	NN
1844	29	8	computing	computing	NN
1844	29	9	.	.	.
1844	30	1	With	with	IN
1844	30	2	this	this	DT
1844	30	3	technology	technology	NN
1844	30	4	,	,	,
1844	30	5	it	-PRON-	PRP
1844	30	6	is	be	VBZ
1844	30	7	possible	possible	JJ
1844	30	8	to	to	TO
1844	30	9	have	have	VB
1844	30	10	facilities	facility	NNS
1844	30	11	such	such	JJ
1844	30	12	as	as	IN
1844	30	13	multiple	multiple	JJ
1844	30	14	execution	execution	NN
1844	30	15	environments	environment	NNS
1844	30	16	,	,	,
1844	30	17	sandboxing	sandboxing	NN
1844	30	18	,	,	,
1844	30	19	server	server	NN
1844	30	20	consolidation	consolidation	NN
1844	30	21	,	,	,
1844	30	22	use	use	NN
1844	30	23	of	of	IN
1844	30	24	multiple	multiple	JJ
1844	30	25	operating	operating	NN
1844	30	26	systems	system	NNS
1844	30	27	,	,	,
1844	30	28	and	and	CC
1844	30	29	software	software	NN
1844	30	30	migration	migration	NN
1844	30	31	,	,	,
1844	30	32	among	among	IN
1844	30	33	others	other	NNS
1844	30	34	.	.	.
1844	31	1	Besides	besides	IN
1844	31	2	virtualization	virtualization	NN
1844	31	3	technologies	technology	NNS
1844	31	4	,	,	,
1844	31	5	emerging	emerge	VBG
1844	31	6	tools	tool	NNS
1844	31	7	that	that	WDT
1844	31	8	allow	allow	VBP
1844	31	9	the	the	DT
1844	31	10	creation	creation	NN
1844	31	11	of	of	IN
1844	31	12	cloud	cloud	NN
1844	31	13	-	-	HYPH
1844	31	14	computing	compute	VBG
1844	31	15	environments	environment	NNS
1844	31	16	also	also	RB
1844	31	17	support	support	VBP
1844	31	18	this	this	DT
1844	31	19	type	type	NN
1844	31	20	of	of	IN
1844	31	21	computing	computing	NN
1844	31	22	model	model	NN
1844	31	23	,	,	,
1844	31	24	providing	provide	VBG
1844	31	25	dynamic	dynamic	JJ
1844	31	26	instantiation	instantiation	NN
1844	31	27	and	and	CC
1844	31	28	release	release	NN
1844	31	29	of	of	IN
1844	31	30	virtual	virtual	JJ
1844	31	31	machines	machine	NNS
1844	31	32	and	and	CC
1844	31	33	software	software	NN
1844	31	34	migration	migration	NN
1844	31	35	.	.	.
1844	32	1	Currently	currently	RB
1844	32	2	,	,	,
1844	32	3	it	-PRON-	PRP
1844	32	4	is	be	VBZ
1844	32	5	possible	possible	JJ
1844	32	6	to	to	TO
1844	32	7	find	find	VB
1844	32	8	several	several	JJ
1844	32	9	examples	example	NNS
1844	32	10	of	of	IN
1844	32	11	public	public	JJ
1844	32	12	cloud	cloud	NN
1844	32	13	storage	storage	NN
1844	32	14	,	,	,
1844	32	15	such	such	JJ
1844	32	16	as	as	IN
1844	32	17	Amazon	Amazon	NNP
1844	32	18	S3	S3	NNP
1844	32	19	(	(	-LRB-
1844	32	20	http://aws.amazon.com/en/s3	http://aws.amazon.com/en/s3	NNP
1844	32	21	)	)	-RRB-
1844	32	22	,	,	,
1844	32	23	RackSpace	RackSpace	NNP
1844	32	24	(	(	-LRB-
1844	32	25	http://www.rackspace.com/cloud/public/files	http://www.rackspace.com/cloud/public/files	NNP
1844	32	26	)	)	-RRB-
1844	32	27	,	,	,
1844	32	28	and	and	CC
1844	32	29	Google	Google	NNP
1844	32	30	Storage	Storage	NNP
1844	32	31	(	(	-LRB-
1844	32	32	https://developers.google.com/storage	https://developers.google.com/storage	ADD
1844	32	33	)	)	-RRB-
1844	32	34	,	,	,
1844	32	35	each	each	DT
1844	32	36	of	of	IN
1844	32	37	which	which	WDT
1844	32	38	provide	provide	VBP
1844	32	39	high	high	JJ
1844	32	40	availability	availability	NN
1844	32	41	,	,	,
1844	32	42	fault	fault	NN
1844	32	43	tolerance	tolerance	NN
1844	32	44	,	,	,
1844	32	45	and	and	CC
1844	32	46	services	service	NNS
1844	32	47	and	and	CC
1844	32	48	administration	administration	NN
1844	32	49	at	at	IN
1844	32	50	low	low	JJ
1844	32	51	cost	cost	NN
1844	32	52	.	.	.
1844	33	1	For	for	IN
1844	33	2	organizations	organization	NNS
1844	33	3	that	that	WDT
1844	33	4	do	do	VBP
1844	33	5	not	not	RB
1844	33	6	want	want	VB
1844	33	7	to	to	TO
1844	33	8	use	use	VB
1844	33	9	a	a	DT
1844	33	10	third	third	JJ
1844	33	11	-	-	HYPH
1844	33	12	party	party	NN
1844	33	13	environment	environment	NN
1844	33	14	to	to	TO
1844	33	15	store	store	VB
1844	33	16	their	-PRON-	PRP$
1844	33	17	data	datum	NNS
1844	33	18	,	,	,
1844	33	19	private	private	JJ
1844	33	20	cloud	cloud	NN
1844	33	21	services	service	NNS
1844	33	22	may	may	MD
1844	33	23	offer	offer	VB
1844	33	24	a	a	DT
1844	33	25	better	well	JJR
1844	33	26	option	option	NN
1844	33	27	,	,	,
1844	33	28	although	although	IN
1844	33	29	the	the	DT
1844	33	30	cost	cost	NN
1844	33	31	is	be	VBZ
1844	33	32	higher	high	JJR
1844	33	33	.	.	.
1844	34	1	In	in	IN
1844	34	2	this	this	DT
1844	34	3	case	case	NN
1844	34	4	,	,	,
1844	34	5	a	a	DT
1844	34	6	hybrid	hybrid	JJ
1844	34	7	cloud	cloud	NN
1844	34	8	model	model	NN
1844	34	9	could	could	MD
1844	34	10	be	be	VB
1844	34	11	an	an	DT
1844	34	12	affordable	affordable	JJ
1844	34	13	solution	solution	NN
1844	34	14	.	.	.
1844	35	1	Organizations	organization	NNS
1844	35	2	or	or	CC
1844	35	3	individual	individual	JJ
1844	35	4	users	user	NNS
1844	35	5	,	,	,
1844	35	6	can	can	MD
1844	35	7	store	store	VB
1844	35	8	sensitive	sensitive	JJ
1844	35	9	or	or	CC
1844	35	10	frequently	frequently	RB
1844	35	11	used	use	VBN
1844	35	12	information	information	NN
1844	35	13	in	in	IN
1844	35	14	the	the	DT
1844	35	15	private	private	JJ
1844	35	16	infrastructure	infrastructure	NN
1844	35	17	and	and	CC
1844	35	18	less	less	RBR
1844	35	19	sensitive	sensitive	JJ
1844	35	20	data	datum	NNS
1844	35	21	in	in	IN
1844	35	22	the	the	DT
1844	35	23	public	public	JJ
1844	35	24	cloud	cloud	NN
1844	35	25	.	.	.
1844	36	1	The	the	DT
1844	36	2	development	development	NN
1844	36	3	of	of	IN
1844	36	4	a	a	DT
1844	36	5	prototype	prototype	NN
1844	36	6	of	of	IN
1844	36	7	a	a	DT
1844	36	8	file	file	NN
1844	36	9	-	-	HYPH
1844	36	10	storage	storage	NN
1844	36	11	service	service	NN
1844	36	12	implemented	implement	VBN
1844	36	13	on	on	IN
1844	36	14	a	a	DT
1844	36	15	private	private	JJ
1844	36	16	and	and	CC
1844	36	17	hybrid	hybrid	JJ
1844	36	18	cloud	cloud	NN
1844	36	19	environment	environment	NN
1844	36	20	using	use	VBG
1844	36	21	mainly	mainly	RB
1844	36	22	free	free	JJ
1844	36	23	and	and	CC
1844	36	24	open	open	JJ
1844	36	25	-	-	HYPH
1844	36	26	source	source	NN
1844	36	27	software	software	NN
1844	36	28	(	(	-LRB-
1844	36	29	FOSS	FOSS	NNP
1844	36	30	)	)	-RRB-
1844	36	31	helped	help	VBD
1844	36	32	us	-PRON-	PRP
1844	36	33	to	to	TO
1844	36	34	analyze	analyze	VB
1844	36	35	the	the	DT
1844	36	36	behavior	behavior	NN
1844	36	37	of	of	IN
1844	36	38	different	different	JJ
1844	36	39	replication	replication	NN
1844	36	40	techniques	technique	NNS
1844	36	41	.	.	.
1844	37	1	We	-PRON-	PRP
1844	37	2	paid	pay	VBD
1844	37	3	special	special	JJ
1844	37	4	attention	attention	NN
1844	37	5	to	to	IN
1844	37	6	the	the	DT
1844	37	7	cost	cost	NN
1844	37	8	of	of	IN
1844	37	9	the	the	DT
1844	37	10	system	system	NN
1844	37	11	implementation	implementation	NN
1844	37	12	,	,	,
1844	37	13	system	system	NN
1844	37	14	efficiency	efficiency	NN
1844	37	15	,	,	,
1844	37	16	resource	resource	NN
1844	37	17	consumption	consumption	NN
1844	37	18	,	,	,
1844	37	19	and	and	CC
1844	37	20	different	different	JJ
1844	37	21	levels	level	NNS
1844	37	22	of	of	IN
1844	37	23	data	datum	NNS
1844	37	24	privacy	privacy	NN
1844	37	25	and	and	CC
1844	37	26	availability	availability	NN
1844	37	27	that	that	WDT
1844	37	28	can	can	MD
1844	37	29	be	be	VB
1844	37	30	achieved	achieve	VBN
1844	37	31	by	by	IN
1844	37	32	each	each	DT
1844	37	33	type	type	NN
1844	37	34	of	of	IN
1844	37	35	system	system	NN
1844	37	36	.	.	.
1844	38	1	http://aws.amazon.com/en/s3	http://aws.amazon.com/en/s3	NNP
1844	38	2	http://www.rackspace.com/cloud/public/files	http://www.rackspace.com/cloud/public/files	NNP
1844	38	3	https://developers.google.com/storage	https://developers.google.com/storage	ADD
1844	38	4	A	a	DT
1844	38	5	FILE	FILE	NNP
1844	38	6	STORAGE	storage	NN
1844	38	7	SERVICE	service	NN
1844	38	8	ON	on	IN
1844	38	9	A	a	DT
1844	38	10	CLOUD	cloud	JJ
1844	38	11	COMPUTING	computing	NN
1844	38	12	ENVIRONMENT	environment	NN
1844	38	13	FOR	for	IN
1844	38	14	DIGITAL	DIGITAL	NNP
1844	38	15	LIBRARIES	library	NNS
1844	38	16	|	|	NNP
1844	38	17	SOSA	SOSA	NNP
1844	38	18	-	-	HYPH
1844	38	19	SOSA	SOSA	NNP
1844	38	20	36	36	CD
1844	38	21	INFRASTRUCTURE	infrastructure	NN
1844	38	22	DESCRIPTION	description	NN
1844	38	23	The	the	DT
1844	38	24	aim	aim	NN
1844	38	25	of	of	IN
1844	38	26	this	this	DT
1844	38	27	prototyping	prototyping	JJ
1844	38	28	project	project	NN
1844	38	29	was	be	VBD
1844	38	30	to	to	TO
1844	38	31	design	design	VB
1844	38	32	and	and	CC
1844	38	33	implement	implement	VB
1844	38	34	scalable	scalable	JJ
1844	38	35	and	and	CC
1844	38	36	elastic	elastic	JJ
1844	38	37	distributed	distribute	VBN
1844	38	38	storage	storage	NN
1844	38	39	architecture	architecture	NN
1844	38	40	in	in	IN
1844	38	41	a	a	DT
1844	38	42	cloud	cloud	NN
1844	38	43	-	-	HYPH
1844	38	44	computing	computing	NN
1844	38	45	environment	environment	NN
1844	38	46	using	use	VBG
1844	38	47	free	free	JJ
1844	38	48	,	,	,
1844	38	49	well	well	RB
1844	38	50	-	-	HYPH
1844	38	51	known	know	VBN
1844	38	52	,	,	,
1844	38	53	open	open	JJ
1844	38	54	-	-	HYPH
1844	38	55	source	source	NN
1844	38	56	tools	tool	NNS
1844	38	57	.	.	.
1844	39	1	This	this	DT
1844	39	2	architecture	architecture	NN
1844	39	3	represents	represent	VBZ
1844	39	4	a	a	DT
1844	39	5	feasible	feasible	JJ
1844	39	6	option	option	NN
1844	39	7	that	that	IN
1844	39	8	digital	digital	JJ
1844	39	9	libraries	library	NNS
1844	39	10	can	can	MD
1844	39	11	adopt	adopt	VB
1844	39	12	to	to	TO
1844	39	13	solve	solve	VB
1844	39	14	financial	financial	JJ
1844	39	15	and	and	CC
1844	39	16	technical	technical	JJ
1844	39	17	challenges	challenge	NNS
1844	39	18	when	when	WRB
1844	39	19	building	build	VBG
1844	39	20	a	a	DT
1844	39	21	cloud	cloud	NN
1844	39	22	-	-	HYPH
1844	39	23	computing	computing	NN
1844	39	24	environment	environment	NN
1844	39	25	.	.	.
1844	40	1	The	the	DT
1844	40	2	architecture	architecture	NN
1844	40	3	combines	combine	VBZ
1844	40	4	private	private	JJ
1844	40	5	and	and	CC
1844	40	6	public	public	JJ
1844	40	7	clouds	cloud	NNS
1844	40	8	by	by	IN
1844	40	9	creating	create	VBG
1844	40	10	a	a	DT
1844	40	11	hybrid	hybrid	JJ
1844	40	12	cloud	cloud	NN
1844	40	13	environment	environment	NN
1844	40	14	.	.	.
1844	41	1	For	for	IN
1844	41	2	this	this	DT
1844	41	3	purpose	purpose	NN
1844	41	4	,	,	,
1844	41	5	we	-PRON-	PRP
1844	41	6	evaluated	evaluate	VBD
1844	41	7	tools	tool	NNS
1844	41	8	such	such	JJ
1844	41	9	as	as	IN
1844	41	10	KVM	KVM	NNP
1844	41	11	and	and	CC
1844	41	12	XEN	XEN	NNP
1844	41	13	,	,	,
1844	41	14	which	which	WDT
1844	41	15	are	be	VBP
1844	41	16	useful	useful	JJ
1844	41	17	for	for	IN
1844	41	18	creating	create	VBG
1844	41	19	virtual	virtual	JJ
1844	41	20	machines	machine	NNS
1844	41	21	(	(	-LRB-
1844	41	22	VM).5	vm).5	VB
1844	41	23	Open	open	JJ
1844	41	24	Nebula	Nebula	NNP
1844	41	25	(	(	-LRB-
1844	41	26	http://opennebula.org	http://opennebula.org	NNP
1844	41	27	)	)	-RRB-
1844	41	28	,	,	,
1844	41	29	Eucalyptus	Eucalyptus	NNP
1844	41	30	(	(	-LRB-
1844	41	31	http://www.eucalyptus.com	http://www.eucalyptus.com	ADD
1844	41	32	)	)	-RRB-
1844	41	33	,	,	,
1844	41	34	and	and	CC
1844	41	35	OpenStack	OpenStack	NNP
1844	41	36	(	(	-LRB-
1844	41	37	http://www.openstack.org	http://www.openstack.org	ADD
1844	41	38	)	)	-RRB-
1844	41	39	are	be	VBP
1844	41	40	good	good	JJ
1844	41	41	,	,	,
1844	41	42	free	free	JJ
1844	41	43	options	option	NNS
1844	41	44	for	for	IN
1844	41	45	managing	manage	VBG
1844	41	46	a	a	DT
1844	41	47	cloud	cloud	NN
1844	41	48	environment	environment	NN
1844	41	49	.	.	.
1844	42	1	We	-PRON-	PRP
1844	42	2	selected	select	VBD
1844	42	3	Open	open	JJ
1844	42	4	Nebula	Nebula	NNP
1844	42	5	for	for	IN
1844	42	6	this	this	DT
1844	42	7	prototype	prototype	NN
1844	42	8	.	.	.
1844	43	1	Commodity	Commodity	NNP
1844	43	2	hard	hard	JJ
1844	43	3	drives	drive	NNS
1844	43	4	have	have	VBP
1844	43	5	a	a	DT
1844	43	6	relatively	relatively	RB
1844	43	7	high	high	JJ
1844	43	8	failure	failure	NN
1844	43	9	rate	rate	NN
1844	43	10	,	,	,
1844	43	11	hence	hence	RB
1844	43	12	our	-PRON-	PRP$
1844	43	13	main	main	JJ
1844	43	14	motivation	motivation	NN
1844	43	15	to	to	TO
1844	43	16	evaluate	evaluate	VB
1844	43	17	different	different	JJ
1844	43	18	replication	replication	NN
1844	43	19	mechanisms	mechanism	NNS
1844	43	20	,	,	,
1844	43	21	providing	provide	VBG
1844	43	22	several	several	JJ
1844	43	23	levels	level	NNS
1844	43	24	of	of	IN
1844	43	25	data	datum	NNS
1844	43	26	availability	availability	NN
1844	43	27	and	and	CC
1844	43	28	fault	fault	NN
1844	43	29	tolerance	tolerance	NN
1844	43	30	.	.	.
1844	44	1	Figure	figure	NN
1844	44	2	1(a	1(a	CD
1844	44	3	)	)	-RRB-
1844	44	4	shows	show	VBZ
1844	44	5	the	the	DT
1844	44	6	core	core	JJ
1844	44	7	components	component	NNS
1844	44	8	of	of	IN
1844	44	9	our	-PRON-	PRP$
1844	44	10	storage	storage	NN
1844	44	11	architecture	architecture	NN
1844	44	12	(	(	-LRB-
1844	44	13	the	the	DT
1844	44	14	private	private	JJ
1844	44	15	cloud	cloud	NN
1844	44	16	)	)	-RRB-
1844	44	17	,	,	,
1844	44	18	and	and	CC
1844	44	19	figure	figure	NN
1844	44	20	1(b	1(b	NNS
1844	44	21	)	)	-RRB-
1844	44	22	shows	show	VBZ
1844	44	23	a	a	DT
1844	44	24	distributed	distribute	VBN
1844	44	25	storage	storage	NN
1844	44	26	web	web	NN
1844	44	27	application	application	NN
1844	44	28	named	name	VBN
1844	44	29	Distributed	distribute	VBN
1844	44	30	Storage	Storage	NNP
1844	44	31	On	on	IN
1844	44	32	the	the	DT
1844	44	33	Cloud	Cloud	NNP
1844	44	34	(	(	-LRB-
1844	44	35	DISOC	DISOC	NNP
1844	44	36	)	)	-RRB-
1844	44	37	,	,	,
1844	44	38	used	use	VBN
1844	44	39	as	as	IN
1844	44	40	a	a	DT
1844	44	41	proof	proof	NN
1844	44	42	of	of	IN
1844	44	43	concept	concept	NN
1844	44	44	.	.	.
1844	45	1	The	the	DT
1844	45	2	private	private	JJ
1844	45	3	cloud	cloud	NN
1844	45	4	also	also	RB
1844	45	5	has	have	VBZ
1844	45	6	an	an	DT
1844	45	7	interface	interface	NN
1844	45	8	to	to	TO
1844	45	9	access	access	VB
1844	45	10	a	a	DT
1844	45	11	public	public	JJ
1844	45	12	cloud	cloud	NN
1844	45	13	,	,	,
1844	45	14	thus	thus	RB
1844	45	15	creating	create	VBG
1844	45	16	a	a	DT
1844	45	17	hybrid	hybrid	JJ
1844	45	18	environment	environment	NN
1844	45	19	.	.	.
1844	46	1	Figure	figure	NN
1844	46	2	1	1	CD
1844	46	3	.	.	.
1844	47	1	Main	main	JJ
1844	47	2	Components	Components	NNP
1844	47	3	of	of	IN
1844	47	4	the	the	DT
1844	47	5	Cloud	Cloud	NNP
1844	47	6	Storage	Storage	NNP
1844	47	7	Architecture	Architecture	NNP
1844	47	8	The	the	DT
1844	47	9	core	core	NN
1844	47	10	components	component	NNS
1844	47	11	and	and	CC
1844	47	12	modules	module	NNS
1844	47	13	of	of	IN
1844	47	14	the	the	DT
1844	47	15	architecture	architecture	NN
1844	47	16	are	be	VBP
1844	47	17	the	the	DT
1844	47	18	following	follow	VBG
1844	47	19	:	:	:
1844	47	20	•	•	VB
1844	47	21	Virtual	virtual	JJ
1844	47	22	Machine	machine	NN
1844	47	23	(	(	-LRB-
1844	47	24	VM	VM	NNP
1844	47	25	)	)	-RRB-
1844	47	26	.	.	.
1844	48	1	We	-PRON-	PRP
1844	48	2	evaluated	evaluate	VBD
1844	48	3	different	different	JJ
1844	48	4	open	open	JJ
1844	48	5	-	-	HYPH
1844	48	6	source	source	NN
1844	48	7	were	be	VBD
1844	48	8	evaluated	evaluate	VBN
1844	48	9	,	,	,
1844	48	10	such	such	JJ
1844	48	11	as	as	IN
1844	48	12	KVM	KVM	NNP
1844	48	13	and	and	CC
1844	48	14	XEN	XEN	NNP
1844	48	15	,	,	,
1844	48	16	for	for	IN
1844	48	17	the	the	DT
1844	48	18	creation	creation	NN
1844	48	19	of	of	IN
1844	48	20	virtual	virtual	JJ
1844	48	21	machines.6	machines.6	CD
1844	48	22	Some	some	DT
1844	48	23	performance	performance	NN
1844	48	24	tests	test	NNS
1844	48	25	were	be	VBD
1844	48	26	done	do	VBN
1844	48	27	,	,	,
1844	48	28	and	and	CC
1844	48	29	KVM	KVM	NNP
1844	48	30	showed	show	VBD
1844	48	31	a	a	DT
1844	48	32	slightly	slightly	RB
1844	48	33	higher	high	JJR
1844	48	34	performance	performance	NN
1844	48	35	than	than	IN
1844	48	36	XEN	XEN	NNP
1844	48	37	.	.	.
1844	49	1	We	-PRON-	PRP
1844	49	2	selected	select	VBD
1844	49	3	KVM	KVM	NNP
1844	49	4	as	as	IN
1844	49	5	the	the	DT
1844	49	6	main	main	JJ
1844	49	7	Virtual	virtual	JJ
1844	49	8	Machine	Machine	NNP
1844	49	9	Manager	Manager	NNP
1844	49	10	(	(	-LRB-
1844	49	11	VMM	VMM	NNP
1844	49	12	)	)	-RRB-
1844	49	13	for	for	IN
1844	49	14	the	the	DT
1844	49	15	proposed	propose	VBN
1844	49	16	architecture	architecture	NN
1844	49	17	.	.	.
1844	50	1	VMMs	vmm	NNS
1844	50	2	also	also	RB
1844	50	3	are	be	VBP
1844	50	4	called	call	VBN
1844	50	5	http://opennebula.org/	http://opennebula.org/	CD
1844	50	6	http://www.eucalyptus.com/	http://www.eucalyptus.com/	NN
1844	50	7	http://www.openstack.org/	http://www.openstack.org/	NN
1844	50	8	INFORMATION	INFORMATION	NNP
1844	50	9	TECHNOLOGY	TECHNOLOGY	NNP
1844	50	10	AND	and	CC
1844	50	11	LIBRARIES	LIBRARIES	NNP
1844	50	12	|	|	NNP
1844	50	13	DECEMBER	DECEMBER	NNP
1844	50	14	2012	2012	CD
1844	50	15	37	37	CD
1844	50	16	Hypervisors	Hypervisors	NNPS
1844	50	17	.	.	.
1844	51	1	Each	each	DT
1844	51	2	VM	VM	NNP
1844	51	3	has	have	VBZ
1844	51	4	a	a	DT
1844	51	5	Linux	Linux	NNP
1844	51	6	operating	operating	NN
1844	51	7	system	system	NN
1844	51	8	that	that	WDT
1844	51	9	is	be	VBZ
1844	51	10	optimized	optimize	VBN
1844	51	11	to	to	TO
1844	51	12	work	work	VB
1844	51	13	in	in	IN
1844	51	14	virtual	virtual	JJ
1844	51	15	environments	environment	NNS
1844	51	16	and	and	CC
1844	51	17	requires	require	VBZ
1844	51	18	a	a	DT
1844	51	19	minimum	minimum	JJ
1844	51	20	consumption	consumption	NN
1844	51	21	of	of	IN
1844	51	22	disk	disk	NN
1844	51	23	space	space	NN
1844	51	24	.	.	.
1844	52	1	The	the	DT
1844	52	2	VM	VM	NNP
1844	52	3	also	also	RB
1844	52	4	includes	include	VBZ
1844	52	5	an	an	DT
1844	52	6	Apache	Apache	NNP
1844	52	7	web	web	NN
1844	52	8	server	server	NN
1844	52	9	,	,	,
1844	52	10	a	a	DT
1844	52	11	PHP	PHP	NNP
1844	52	12	module	module	NN
1844	52	13	,	,	,
1844	52	14	and	and	CC
1844	52	15	some	some	DT
1844	52	16	basic	basic	JJ
1844	52	17	tools	tool	NNS
1844	52	18	that	that	WDT
1844	52	19	were	be	VBD
1844	52	20	used	use	VBN
1844	52	21	to	to	TO
1844	52	22	build	build	VB
1844	52	23	the	the	DT
1844	52	24	DISOC	DISOC	NNP
1844	52	25	web	web	NN
1844	52	26	application	application	NN
1844	52	27	.	.	.
1844	53	1	Every	every	DT
1844	53	2	VM	VM	NNP
1844	53	3	is	be	VBZ
1844	53	4	able	able	JJ
1844	53	5	to	to	TO
1844	53	6	transparently	transparently	RB
1844	53	7	access	access	VB
1844	53	8	a	a	DT
1844	53	9	pool	pool	NN
1844	53	10	of	of	IN
1844	53	11	disks	disk	NNS
1844	53	12	through	through	IN
1844	53	13	a	a	DT
1844	53	14	special	special	JJ
1844	53	15	data	data	NN
1844	53	16	access	access	NN
1844	53	17	module	module	NN
1844	53	18	,	,	,
1844	53	19	which	which	WDT
1844	53	20	we	-PRON-	PRP
1844	53	21	called	call	VBD
1844	53	22	DAM	DAM	NNP
1844	53	23	.	.	.
1844	54	1	More	More	JJR
1844	54	2	details	detail	NNS
1844	54	3	about	about	IN
1844	54	4	DAM	dam	NN
1844	54	5	follow	follow	NN
1844	54	6	.	.	.
1844	55	1	•	•	VB
1844	55	2	Virtual	virtual	JJ
1844	55	3	Machine	machine	NN
1844	55	4	Manager	Manager	NNP
1844	55	5	Module	Module	NNP
1844	55	6	(	(	-LRB-
1844	55	7	VMMM	VMMM	NNP
1844	55	8	)	)	-RRB-
1844	55	9	.	.	.
1844	56	1	This	this	DT
1844	56	2	has	have	VBZ
1844	56	3	the	the	DT
1844	56	4	function	function	NN
1844	56	5	of	of	IN
1844	56	6	dynamic	dynamic	JJ
1844	56	7	instantiation	instantiation	NN
1844	56	8	and	and	CC
1844	56	9	de	de	NN
1844	56	10	-	-	NN
1844	56	11	instantiation	instantiation	NN
1844	56	12	of	of	IN
1844	56	13	virtual	virtual	JJ
1844	56	14	machines	machine	NNS
1844	56	15	depending	depend	VBG
1844	56	16	on	on	IN
1844	56	17	the	the	DT
1844	56	18	current	current	JJ
1844	56	19	load	load	NN
1844	56	20	on	on	IN
1844	56	21	the	the	DT
1844	56	22	infrastructure	infrastructure	NN
1844	56	23	.	.	.
1844	57	1	•	•	NNP
1844	57	2	Data	Data	NNP
1844	57	3	Access	Access	NNP
1844	57	4	Module	Module	NNP
1844	57	5	(	(	-LRB-
1844	57	6	DAM	DAM	NNP
1844	57	7	)	)	-RRB-
1844	57	8	.	.	.
1844	58	1	All	all	DT
1844	58	2	of	of	IN
1844	58	3	the	the	DT
1844	58	4	virtual	virtual	JJ
1844	58	5	disk	disk	NN
1844	58	6	space	space	NN
1844	58	7	required	require	VBN
1844	58	8	by	by	IN
1844	58	9	every	every	DT
1844	58	10	VM	VM	NNP
1844	58	11	was	be	VBD
1844	58	12	obtained	obtain	VBN
1844	58	13	through	through	IN
1844	58	14	the	the	DT
1844	58	15	Data	Data	NNP
1844	58	16	Access	Access	NNP
1844	58	17	Module	Module	NNP
1844	58	18	Interface	Interface	NNP
1844	58	19	(	(	-LRB-
1844	58	20	DAM	dam	NN
1844	58	21	-	-	:
1844	58	22	I	i	NN
1844	58	23	)	)	-RRB-
1844	58	24	.	.	.
1844	59	1	DAM	dam	NN
1844	59	2	-	-	:
1844	59	3	I	-PRON-	PRP
1844	59	4	allows	allow	VBZ
1844	59	5	VMs	vm	NNS
1844	59	6	to	to	TO
1844	59	7	access	access	NN
1844	59	8	disk	disk	NN
1844	59	9	space	space	NN
1844	59	10	by	by	IN
1844	59	11	calling	call	VBG
1844	59	12	DAM	DAM	NNP
1844	59	13	,	,	,
1844	59	14	which	which	WDT
1844	59	15	provides	provide	VBZ
1844	59	16	transparent	transparent	JJ
1844	59	17	access	access	NN
1844	59	18	to	to	IN
1844	59	19	the	the	DT
1844	59	20	different	different	JJ
1844	59	21	disks	disk	NNS
1844	59	22	that	that	WDT
1844	59	23	are	be	VBP
1844	59	24	part	part	NN
1844	59	25	of	of	IN
1844	59	26	the	the	DT
1844	59	27	storage	storage	NN
1844	59	28	infrastructure	infrastructure	NN
1844	59	29	.	.	.
1844	60	1	DAM	dam	NN
1844	60	2	allocates	allocate	NNS
1844	60	3	and	and	CC
1844	60	4	retrieves	retrieve	VBZ
1844	60	5	files	file	NNS
1844	60	6	stored	store	VBN
1844	60	7	throughout	throughout	IN
1844	60	8	multiple	multiple	JJ
1844	60	9	file	file	NN
1844	60	10	servers	server	NNS
1844	60	11	.	.	.
1844	61	1	•	•	NNP
1844	61	2	Load	Load	NNP
1844	61	3	Balancer	Balancer	NNP
1844	61	4	Module	Module	NNP
1844	61	5	(	(	-LRB-
1844	61	6	LBM	LBM	NNP
1844	61	7	)	)	-RRB-
1844	61	8	.	.	.
1844	62	1	This	this	DT
1844	62	2	distributes	distribute	VBZ
1844	62	3	the	the	DT
1844	62	4	load	load	NN
1844	62	5	among	among	IN
1844	62	6	different	different	JJ
1844	62	7	VMs	vm	NNS
1844	62	8	instantiated	instantiate	VBN
1844	62	9	on	on	IN
1844	62	10	the	the	DT
1844	62	11	physical	physical	JJ
1844	62	12	servers	server	NNS
1844	62	13	that	that	WDT
1844	62	14	make	make	VBP
1844	62	15	up	up	RP
1844	62	16	the	the	DT
1844	62	17	private	private	JJ
1844	62	18	cloud	cloud	NN
1844	62	19	.	.	.
1844	63	1	•	•	NNP
1844	63	2	Load	Load	NNP
1844	63	3	Manager	Manager	NNP
1844	63	4	(	(	-LRB-
1844	63	5	LM	LM	NNP
1844	63	6	)	)	-RRB-
1844	63	7	.	.	.
1844	64	1	This	this	DT
1844	64	2	monitors	monitor	VBZ
1844	64	3	the	the	DT
1844	64	4	load	load	NN
1844	64	5	that	that	WDT
1844	64	6	can	can	MD
1844	64	7	occur	occur	VB
1844	64	8	in	in	IN
1844	64	9	the	the	DT
1844	64	10	private	private	JJ
1844	64	11	cloud	cloud	NN
1844	64	12	.	.	.
1844	65	1	•	•	NNP
1844	65	2	Distributed	distribute	VBN
1844	65	3	Storage	storage	NN
1844	65	4	on	on	IN
1844	65	5	the	the	DT
1844	65	6	Cloud	Cloud	NNP
1844	65	7	(	(	-LRB-
1844	65	8	DISOC	DISOC	NNP
1844	65	9	)	)	-RRB-
1844	65	10	.	.	.
1844	66	1	This	this	DT
1844	66	2	is	be	VBZ
1844	66	3	a	a	DT
1844	66	4	web	web	NN
1844	66	5	-	-	HYPH
1844	66	6	based	base	VBN
1844	66	7	file	file	NN
1844	66	8	-	-	HYPH
1844	66	9	storage	storage	NN
1844	66	10	system	system	NN
1844	66	11	that	that	WDT
1844	66	12	is	be	VBZ
1844	66	13	used	use	VBN
1844	66	14	as	as	IN
1844	66	15	a	a	DT
1844	66	16	proof	proof	NN
1844	66	17	of	of	IN
1844	66	18	concept	concept	NN
1844	66	19	and	and	CC
1844	66	20	was	be	VBD
1844	66	21	implemented	implement	VBN
1844	66	22	based	base	VBN
1844	66	23	on	on	IN
1844	66	24	the	the	DT
1844	66	25	proposed	propose	VBN
1844	66	26	architecture	architecture	NN
1844	66	27	.	.	.
1844	67	1	REPLICATION	REPLICATION	NNP
1844	67	2	TECHNIQUES	TECHNIQUES	NNP
1844	67	3	High	high	JJ
1844	67	4	availability	availability	NN
1844	67	5	is	be	VBZ
1844	67	6	one	one	CD
1844	67	7	of	of	IN
1844	67	8	the	the	DT
1844	67	9	important	important	JJ
1844	67	10	features	feature	NNS
1844	67	11	offered	offer	VBN
1844	67	12	in	in	IN
1844	67	13	a	a	DT
1844	67	14	storage	storage	NN
1844	67	15	service	service	NN
1844	67	16	deployed	deploy	VBN
1844	67	17	in	in	IN
1844	67	18	the	the	DT
1844	67	19	cloud	cloud	NN
1844	67	20	.	.	.
1844	68	1	The	the	DT
1844	68	2	use	use	NN
1844	68	3	of	of	IN
1844	68	4	replication	replication	NN
1844	68	5	techniques	technique	NNS
1844	68	6	has	have	VBZ
1844	68	7	been	be	VBN
1844	68	8	the	the	DT
1844	68	9	most	most	RBS
1844	68	10	useful	useful	JJ
1844	68	11	proposal	proposal	NN
1844	68	12	to	to	TO
1844	68	13	achieve	achieve	VB
1844	68	14	this	this	DT
1844	68	15	feature	feature	NN
1844	68	16	.	.	.
1844	69	1	DAM	dam	NN
1844	69	2	is	be	VBZ
1844	69	3	the	the	DT
1844	69	4	component	component	NN
1844	69	5	that	that	WDT
1844	69	6	provides	provide	VBZ
1844	69	7	different	different	JJ
1844	69	8	levels	level	NNS
1844	69	9	of	of	IN
1844	69	10	data	datum	NNS
1844	69	11	availability	availability	NN
1844	69	12	.	.	.
1844	70	1	It	-PRON-	PRP
1844	70	2	currently	currently	RB
1844	70	3	includes	include	VBZ
1844	70	4	the	the	DT
1844	70	5	following	follow	VBG
1844	70	6	replication	replication	NN
1844	70	7	policies	policy	NNS
1844	70	8	:	:	:
1844	70	9	no	no	DT
1844	70	10	-	-	HYPH
1844	70	11	replication	replication	NN
1844	70	12	,	,	,
1844	70	13	total	total	JJ
1844	70	14	-	-	HYPH
1844	70	15	replication	replication	NN
1844	70	16	,	,	,
1844	70	17	mirroring	mirroring	NN
1844	70	18	,	,	,
1844	70	19	and	and	CC
1844	70	20	IDA	IDA	NNP
1844	70	21	-	-	HYPH
1844	70	22	based	base	VBN
1844	70	23	replication	replication	NN
1844	70	24	.	.	.
1844	71	1	•	•	NNP
1844	71	2	No	No	NNP
1844	71	3	-	-	HYPH
1844	71	4	Replication	replication	NN
1844	71	5	.	.	.
1844	72	1	This	this	DT
1844	72	2	replication	replication	NN
1844	72	3	policy	policy	NN
1844	72	4	represents	represent	VBZ
1844	72	5	the	the	DT
1844	72	6	data	data	NN
1844	72	7	availability	availability	NN
1844	72	8	method	method	NN
1844	72	9	with	with	IN
1844	72	10	the	the	DT
1844	72	11	lowest	low	JJS
1844	72	12	level	level	NN
1844	72	13	of	of	IN
1844	72	14	fault	fault	NN
1844	72	15	tolerance	tolerance	NN
1844	72	16	.	.	.
1844	73	1	In	in	IN
1844	73	2	this	this	DT
1844	73	3	method	method	NN
1844	73	4	,	,	,
1844	73	5	only	only	RB
1844	73	6	the	the	DT
1844	73	7	original	original	JJ
1844	73	8	version	version	NN
1844	73	9	of	of	IN
1844	73	10	a	a	DT
1844	73	11	file	file	NN
1844	73	12	is	be	VBZ
1844	73	13	stored	store	VBN
1844	73	14	in	in	IN
1844	73	15	the	the	DT
1844	73	16	disk	disk	NN
1844	73	17	pool	pool	NN
1844	73	18	.	.	.
1844	74	1	It	-PRON-	PRP
1844	74	2	follows	follow	VBZ
1844	74	3	a	a	DT
1844	74	4	round	round	JJ
1844	74	5	-	-	HYPH
1844	74	6	robin	robin	NN
1844	74	7	allocation	allocation	NN
1844	74	8	policy	policy	NN
1844	74	9	whereby	whereby	WRB
1844	74	10	load	load	NN
1844	74	11	assignation	assignation	NN
1844	74	12	is	be	VBZ
1844	74	13	made	make	VBN
1844	74	14	based	base	VBN
1844	74	15	on	on	IN
1844	74	16	a	a	DT
1844	74	17	circularly	circularly	RB
1844	74	18	linked	link	VBN
1844	74	19	list	list	NN
1844	74	20	,	,	,
1844	74	21	taking	take	VBG
1844	74	22	into	into	IN
1844	74	23	account	account	NN
1844	74	24	disk	disk	NN
1844	74	25	availability	availability	NN
1844	74	26	.	.	.
1844	75	1	This	this	DT
1844	75	2	policy	policy	NN
1844	75	3	prevents	prevent	VBZ
1844	75	4	all	all	DT
1844	75	5	files	file	NNS
1844	75	6	from	from	IN
1844	75	7	being	be	VBG
1844	75	8	allocated	allocate	VBN
1844	75	9	to	to	IN
1844	75	10	the	the	DT
1844	75	11	same	same	JJ
1844	75	12	server	server	NN
1844	75	13	,	,	,
1844	75	14	providing	provide	VBG
1844	75	15	a	a	DT
1844	75	16	minimal	minimal	JJ
1844	75	17	fault	fault	NN
1844	75	18	tolerance	tolerance	NN
1844	75	19	in	in	IN
1844	75	20	case	case	NN
1844	75	21	a	a	DT
1844	75	22	server	server	NN
1844	75	23	failure	failure	NN
1844	75	24	.	.	.
1844	76	1	•	•	NNP
1844	76	2	Mirroring	Mirroring	NNP
1844	76	3	.	.	.
1844	77	1	This	this	DT
1844	77	2	replication	replication	NN
1844	77	3	technique	technique	NN
1844	77	4	is	be	VBZ
1844	77	5	a	a	DT
1844	77	6	simple	simple	JJ
1844	77	7	way	way	NN
1844	77	8	to	to	TO
1844	77	9	ensure	ensure	VB
1844	77	10	higher	high	JJR
1844	77	11	availability	availability	NN
1844	77	12	without	without	IN
1844	77	13	high	high	JJ
1844	77	14	resource	resource	NN
1844	77	15	consumption	consumption	NN
1844	77	16	.	.	.
1844	78	1	In	in	IN
1844	78	2	this	this	DT
1844	78	3	replication	replication	NN
1844	78	4	,	,	,
1844	78	5	every	every	DT
1844	78	6	time	time	NN
1844	78	7	a	a	DT
1844	78	8	file	file	NN
1844	78	9	is	be	VBZ
1844	78	10	stored	store	VBN
1844	78	11	in	in	IN
1844	78	12	a	a	DT
1844	78	13	disk	disk	NN
1844	78	14	,	,	,
1844	78	15	the	the	DT
1844	78	16	DAM	DAM	NNP
1844	78	17	creates	create	VBZ
1844	78	18	a	a	DT
1844	78	19	copy	copy	NN
1844	78	20	and	and	CC
1844	78	21	places	place	VBZ
1844	78	22	it	-PRON-	PRP
1844	78	23	on	on	IN
1844	78	24	a	a	DT
1844	78	25	different	different	JJ
1844	78	26	disk	disk	NN
1844	78	27	.	.	.
1844	79	1	•	•	NNP
1844	79	2	Total	total	JJ
1844	79	3	-	-	HYPH
1844	79	4	replication	replication	NN
1844	79	5	.	.	.
1844	80	1	This	this	DT
1844	80	2	represents	represent	VBZ
1844	80	3	the	the	DT
1844	80	4	highest	high	JJS
1844	80	5	data	data	NN
1844	80	6	availability	availability	NN
1844	80	7	approach	approach	NN
1844	80	8	.	.	.
1844	81	1	In	in	IN
1844	81	2	this	this	DT
1844	81	3	technique	technique	NN
1844	81	4	,	,	,
1844	81	5	a	a	DT
1844	81	6	copy	copy	NN
1844	81	7	of	of	IN
1844	81	8	the	the	DT
1844	81	9	file	file	NN
1844	81	10	is	be	VBZ
1844	81	11	stored	store	VBN
1844	81	12	on	on	IN
1844	81	13	all	all	DT
1844	81	14	of	of	IN
1844	81	15	the	the	DT
1844	81	16	file	file	NN
1844	81	17	servers	server	NNS
1844	81	18	available	available	JJ
1844	81	19	.	.	.
1844	82	1	Total	total	JJ
1844	82	2	-	-	HYPH
1844	82	3	replication	replication	NN
1844	82	4	also	also	RB
1844	82	5	requires	require	VBZ
1844	82	6	the	the	DT
1844	82	7	highest	high	JJS
1844	82	8	consumption	consumption	NN
1844	82	9	of	of	IN
1844	82	10	resources	resource	NNS
1844	82	11	.	.	.
1844	83	1	•	•	NNP
1844	83	2	IDA	IDA	NNP
1844	83	3	-	-	HYPH
1844	83	4	based	base	VBN
1844	83	5	replication	replication	NN
1844	83	6	.	.	.
1844	84	1	To	to	TO
1844	84	2	provide	provide	VB
1844	84	3	higher	high	JJR
1844	84	4	data	datum	NNS
1844	84	5	availability	availability	NN
1844	84	6	with	with	IN
1844	84	7	less	less	JJR
1844	84	8	impact	impact	NN
1844	84	9	on	on	IN
1844	84	10	the	the	DT
1844	84	11	consumption	consumption	NN
1844	84	12	of	of	IN
1844	84	13	resources	resource	NNS
1844	84	14	,	,	,
1844	84	15	an	an	DT
1844	84	16	alternative	alternative	JJ
1844	84	17	approach	approach	NN
1844	84	18	based	base	VBN
1844	84	19	on	on	IN
1844	84	20	information	information	NN
1844	84	21	-	-	HYPH
1844	84	22	dispersal	dispersal	NN
1844	84	23	techniques	technique	NNS
1844	84	24	can	can	MD
1844	84	25	be	be	VB
1844	84	26	used	use	VBN
1844	84	27	.	.	.
1844	85	1	The	the	DT
1844	85	2	Information	Information	NNP
1844	85	3	Dispersal	Dispersal	NNP
1844	85	4	Algorithm	Algorithm	NNP
1844	85	5	(	(	-LRB-
1844	85	6	IDA	IDA	NNP
1844	85	7	)	)	-RRB-
1844	85	8	is	be	VBZ
1844	85	9	an	an	DT
1844	85	10	example	example	NN
1844	85	11	of	of	IN
1844	85	12	this	this	DT
1844	85	13	A	A	NNP
1844	85	14	FILE	FILE	NNP
1844	85	15	STORAGE	STORAGE	NNP
1844	85	16	SERVICE	service	NN
1844	85	17	ON	on	IN
1844	85	18	A	a	DT
1844	85	19	CLOUD	cloud	JJ
1844	85	20	COMPUTING	computing	NN
1844	85	21	ENVIRONMENT	environment	NN
1844	85	22	FOR	for	IN
1844	85	23	DIGITAL	DIGITAL	NNP
1844	85	24	LIBRARIES	library	NNS
1844	85	25	|	|	NNP
1844	85	26	SOSA	SOSA	NNP
1844	85	27	-	-	HYPH
1844	85	28	SOSA	SOSA	NNP
1844	85	29	38	38	CD
1844	85	30	strategy.7	strategy.7	CD
1844	85	31	When	when	WRB
1844	85	32	a	a	DT
1844	85	33	file	file	NN
1844	85	34	(	(	-LRB-
1844	85	35	of	of	IN
1844	85	36	size	size	NN
1844	85	37	|F|	|F|	NFP
1844	85	38	)	)	-RRB-
1844	85	39	is	be	VBZ
1844	85	40	required	require	VBN
1844	85	41	to	to	TO
1844	85	42	be	be	VB
1844	85	43	stored	store	VBN
1844	85	44	using	use	VBG
1844	85	45	the	the	DT
1844	85	46	IDA	IDA	NNP
1844	85	47	,	,	,
1844	85	48	the	the	DT
1844	85	49	file	file	NN
1844	85	50	is	be	VBZ
1844	85	51	partitioned	partition	VBN
1844	85	52	into	into	IN
1844	85	53	n	n	DT
1844	85	54	fragments	fragment	NNS
1844	85	55	of	of	IN
1844	85	56	size	size	NN
1844	85	57	|F|/m	|f|/m	NN
1844	85	58	,	,	,
1844	85	59	where	where	WRB
1844	85	60	m	m	NNP
1844	85	61	<	<	XX
1844	85	62	n	n	XX
1844	85	63	.	.	.
1844	86	1	These	these	DT
1844	86	2	fragments	fragment	NNS
1844	86	3	are	be	VBP
1844	86	4	distributed	distribute	VBN
1844	86	5	in	in	IN
1844	86	6	n	n	JJ
1844	86	7	different	different	JJ
1844	86	8	disks	disk	NNS
1844	86	9	.	.	.
1844	87	1	The	the	DT
1844	87	2	IDA	IDA	NNP
1844	87	3	only	only	RB
1844	87	4	needs	need	VBZ
1844	87	5	to	to	TO
1844	87	6	obtain	obtain	VB
1844	87	7	m	m	NN
1844	87	8	fragments	fragment	NNS
1844	87	9	to	to	TO
1844	87	10	reconstruct	reconstruct	VB
1844	87	11	the	the	DT
1844	87	12	original	original	JJ
1844	87	13	file	file	NN
1844	87	14	.	.	.
1844	88	1	In	in	IN
1844	88	2	this	this	DT
1844	88	3	context	context	NN
1844	88	4	,	,	,
1844	88	5	even	even	RB
1844	88	6	if	if	IN
1844	88	7	n	n	NNP
1844	88	8	-	-	HYPH
1844	88	9	m	m	NNP
1844	88	10	disks	disk	NNS
1844	88	11	failed	fail	VBD
1844	88	12	,	,	,
1844	88	13	the	the	DT
1844	88	14	file	file	NN
1844	88	15	would	would	MD
1844	88	16	still	still	RB
1844	88	17	be	be	VB
1844	88	18	recovered	recover	VBN
1844	88	19	.	.	.
1844	89	1	It	-PRON-	PRP
1844	89	2	is	be	VBZ
1844	89	3	desirable	desirable	JJ
1844	89	4	that	that	IN
1844	89	5	no	no	DT
1844	89	6	more	more	JJR
1844	89	7	than	than	IN
1844	89	8	n	n	NNP
1844	89	9	-	-	HYPH
1844	89	10	m	m	NN
1844	89	11	file	file	NN
1844	89	12	servers	server	NNS
1844	89	13	fail	fail	VBP
1844	89	14	.	.	.
1844	90	1	The	the	DT
1844	90	2	IDA	IDA	NNP
1844	90	3	provides	provide	VBZ
1844	90	4	better	well	JJR
1844	90	5	fault	fault	NN
1844	90	6	tolerance	tolerance	NN
1844	90	7	than	than	IN
1844	90	8	mirroring	mirror	VBG
1844	90	9	without	without	IN
1844	90	10	the	the	DT
1844	90	11	need	need	NN
1844	90	12	to	to	TO
1844	90	13	completely	completely	RB
1844	90	14	replicate	replicate	VB
1844	90	15	the	the	DT
1844	90	16	original	original	JJ
1844	90	17	file	file	NN
1844	90	18	.	.	.
1844	91	1	In	in	IN
1844	91	2	this	this	DT
1844	91	3	prototype	prototype	NN
1844	91	4	,	,	,
1844	91	5	the	the	DT
1844	91	6	IDA	IDA	NNP
1844	91	7	was	be	VBD
1844	91	8	evaluated	evaluate	VBN
1844	91	9	with	with	IN
1844	91	10	n=5	n=5	NNS
1844	91	11	and	and	CC
1844	91	12	m=3	m=3	NN
1844	91	13	(	(	-LRB-
1844	91	14	which	which	WDT
1844	91	15	means	mean	VBZ
1844	91	16	only	only	RB
1844	91	17	60	60	CD
1844	91	18	percent	percent	NN
1844	91	19	of	of	IN
1844	91	20	the	the	DT
1844	91	21	original	original	JJ
1844	91	22	file	file	NN
1844	91	23	was	be	VBD
1844	91	24	replicated	replicate	VBN
1844	91	25	)	)	-RRB-
1844	91	26	.	.	.
1844	92	1	The	the	DT
1844	92	2	IDA	IDA	NNP
1844	92	3	is	be	VBZ
1844	92	4	attractive	attractive	JJ
1844	92	5	for	for	IN
1844	92	6	a	a	DT
1844	92	7	hybrid	hybrid	JJ
1844	92	8	cloud	cloud	NN
1844	92	9	environment	environment	NN
1844	92	10	because	because	IN
1844	92	11	it	-PRON-	PRP
1844	92	12	is	be	VBZ
1844	92	13	not	not	RB
1844	92	14	necessary	necessary	JJ
1844	92	15	to	to	TO
1844	92	16	save	save	VB
1844	92	17	the	the	DT
1844	92	18	entire	entire	JJ
1844	92	19	file	file	NN
1844	92	20	on	on	IN
1844	92	21	a	a	DT
1844	92	22	single	single	JJ
1844	92	23	file	file	NN
1844	92	24	server	server	NN
1844	92	25	(	(	-LRB-
1844	92	26	disk	disk	NN
1844	92	27	)	)	-RRB-
1844	92	28	.	.	.
1844	93	1	In	in	IN
1844	93	2	this	this	DT
1844	93	3	way	way	NN
1844	93	4	,	,	,
1844	93	5	it	-PRON-	PRP
1844	93	6	could	could	MD
1844	93	7	be	be	VB
1844	93	8	possible	possible	JJ
1844	93	9	to	to	TO
1844	93	10	send	send	VB
1844	93	11	k	k	NN
1844	93	12	fragments	fragment	NNS
1844	93	13	of	of	IN
1844	93	14	the	the	DT
1844	93	15	file	file	NN
1844	93	16	(	(	-LRB-
1844	93	17	where	where	WRB
1844	93	18	k	k	NNP
1844	93	19	<	<	XX
1844	93	20	m	m	NNP
1844	93	21	)	)	-RRB-
1844	93	22	to	to	IN
1844	93	23	a	a	DT
1844	93	24	public	public	JJ
1844	93	25	cloud	cloud	NN
1844	93	26	storage	storage	NN
1844	93	27	without	without	IN
1844	93	28	revealing	reveal	VBG
1844	93	29	the	the	DT
1844	93	30	complete	complete	JJ
1844	93	31	content	content	NN
1844	93	32	of	of	IN
1844	93	33	the	the	DT
1844	93	34	original	original	JJ
1844	93	35	file	file	NN
1844	93	36	.	.	.
1844	94	1	This	this	DT
1844	94	2	strategy	strategy	NN
1844	94	3	works	work	VBZ
1844	94	4	similar	similar	JJ
1844	94	5	to	to	IN
1844	94	6	Redundant	Redundant	NNP
1844	94	7	Array	Array	NNP
1844	94	8	of	of	IN
1844	94	9	Independent	Independent	NNP
1844	94	10	Disks	Disks	NNP
1844	94	11	(	(	-LRB-
1844	94	12	RAID	RAID	NNP
1844	94	13	)	)	-RRB-
1844	94	14	5	5	CD
1844	94	15	in	in	IN
1844	94	16	that	that	IN
1844	94	17	it	-PRON-	PRP
1844	94	18	is	be	VBZ
1844	94	19	a	a	DT
1844	94	20	type	type	NN
1844	94	21	of	of	IN
1844	94	22	block	block	NN
1844	94	23	-	-	HYPH
1844	94	24	level	level	NN
1844	94	25	striping	striping	JJ
1844	94	26	storage	storage	NN
1844	94	27	technology	technology	NN
1844	94	28	,	,	,
1844	94	29	which	which	WDT
1844	94	30	distributes	distribute	VBZ
1844	94	31	parity	parity	NN
1844	94	32	or	or	CC
1844	94	33	data	datum	NNS
1844	94	34	about	about	IN
1844	94	35	the	the	DT
1844	94	36	data	datum	NNS
1844	94	37	along	along	IN
1844	94	38	with	with	IN
1844	94	39	the	the	DT
1844	94	40	data	datum	NNS
1844	94	41	itself.8	itself.8	-LRB-
1844	94	42	However	however	RB
1844	94	43	,	,	,
1844	94	44	the	the	DT
1844	94	45	IDA	IDA	NNP
1844	94	46	uses	use	VBZ
1844	94	47	a	a	DT
1844	94	48	different	different	JJ
1844	94	49	strategy	strategy	NN
1844	94	50	for	for	IN
1844	94	51	data	data	NN
1844	94	52	reconstruction	reconstruction	NN
1844	94	53	and	and	CC
1844	94	54	could	could	MD
1844	94	55	be	be	VB
1844	94	56	implemented	implement	VBN
1844	94	57	in	in	IN
1844	94	58	a	a	DT
1844	94	59	distributed	distributed	JJ
1844	94	60	environment	environment	NN
1844	94	61	using	use	VBG
1844	94	62	from	from	IN
1844	94	63	2	2	CD
1844	94	64	to	to	IN
1844	94	65	n	n	CC
1844	94	66	storage	storage	NN
1844	94	67	servers	server	NNS
1844	94	68	.	.	.
1844	95	1	PERFORMANCE	performance	NN
1844	95	2	EVALUATION	EVALUATION	VBD
1844	95	3	We	-PRON-	PRP
1844	95	4	implemented	implement	VBD
1844	95	5	and	and	CC
1844	95	6	used	use	VBD
1844	95	7	a	a	DT
1844	95	8	prototype	prototype	NN
1844	95	9	of	of	IN
1844	95	10	this	this	DT
1844	95	11	architecture	architecture	NN
1844	95	12	as	as	IN
1844	95	13	the	the	DT
1844	95	14	evaluation	evaluation	NN
1844	95	15	scenario	scenario	NN
1844	95	16	.	.	.
1844	96	1	It	-PRON-	PRP
1844	96	2	includes	include	VBZ
1844	96	3	five	five	CD
1844	96	4	commercial	commercial	JJ
1844	96	5	PCs	pc	NNS
1844	96	6	(	(	-LRB-
1844	96	7	commodity	commodity	NN
1844	96	8	)	)	-RRB-
1844	96	9	,	,	,
1844	96	10	whose	whose	WP$
1844	96	11	characteristics	characteristic	NNS
1844	96	12	are	be	VBP
1844	96	13	shown	show	VBN
1844	96	14	in	in	IN
1844	96	15	the	the	DT
1844	96	16	first	first	JJ
1844	96	17	section	section	NN
1844	96	18	of	of	IN
1844	96	19	table	table	NN
1844	96	20	1	1	CD
1844	96	21	.	.	.
1844	97	1	The	the	DT
1844	97	2	features	feature	NNS
1844	97	3	of	of	IN
1844	97	4	the	the	DT
1844	97	5	VMs	vm	NNS
1844	97	6	that	that	WDT
1844	97	7	were	be	VBD
1844	97	8	instantiated	instantiate	VBN
1844	97	9	on	on	IN
1844	97	10	these	these	DT
1844	97	11	PCs	pc	NNS
1844	97	12	are	be	VBP
1844	97	13	shown	show	VBN
1844	97	14	in	in	IN
1844	97	15	the	the	DT
1844	97	16	second	second	JJ
1844	97	17	section	section	NN
1844	97	18	of	of	IN
1844	97	19	table	table	NN
1844	97	20	1	1	CD
1844	97	21	.	.	.
1844	98	1	Physical	Physical	NNP
1844	98	2	Machines	Machines	NNPS
1844	98	3	PCs	pc	NNS
1844	98	4	Cores	core	VBZ
1844	98	5	Memory	Memory	NNP
1844	98	6	Hard	hard	JJ
1844	98	7	disk	disk	NN
1844	98	8	Network	Network	NNP
1844	98	9	1	1	CD
1844	98	10	pc	pc	NN
1844	98	11	4	4	CD
1844	98	12	4	4	CD
1844	98	13	Gb	gb	POS
1844	98	14	640	640	CD
1844	98	15	Gb	Gb	NNP
1844	98	16	Ethernet	Ethernet	NNP
1844	98	17	10/100	10/100	CD
1844	98	18	4	4	CD
1844	98	19	pc	pc	NN
1844	98	20	2	2	CD
1844	98	21	2	2	CD
1844	98	22	Gb	Gb	NNP
1844	98	23	250	250	CD
1844	98	24	Gb	Gb	NNS
1844	98	25	Ethernet	ethernet	NN
1844	98	26	10/100	10/100	CD
1844	98	27	Virtual	Virtual	NNP
1844	98	28	Machines	Machines	NNPS
1844	98	29	8	8	CD
1844	98	30	vm	vm	CC
1844	98	31	1	1	CD
1844	98	32	1	1	CD
1844	98	33	Gb	gb	POS
1844	98	34	1	1	CD
1844	98	35	Gb	Gb	NNP
1844	98	36	Virtual	Virtual	NNP
1844	98	37	Ethernet	Ethernet	NNP
1844	98	38	1	1	CD
1844	98	39	vm	vm	CC
1844	98	40	1	1	CD
1844	98	41	128	128	CD
1844	98	42	Mb	mb	NN
1844	98	43	1	1	CD
1844	98	44	Gb	Gb	NNP
1844	98	45	Virtual	virtual	JJ
1844	98	46	Ethernet	ethernet	NN
1844	98	47	Table	table	NN
1844	98	48	1	1	CD
1844	98	49	.	.	.
1844	99	1	Characteristics	Characteristics	NNP
1844	99	2	of	of	IN
1844	99	3	the	the	DT
1844	99	4	Physical	Physical	NNP
1844	99	5	PCs	pc	NNS
1844	99	6	and	and	CC
1844	99	7	VMs	vm	NNS
1844	99	8	Used	use	VBN
1844	99	9	in	in	IN
1844	99	10	the	the	DT
1844	99	11	Private	Private	NNP
1844	99	12	Cloud	Cloud	NNP
1844	99	13	We	-PRON-	PRP
1844	99	14	created	create	VBD
1844	99	15	nine	nine	CD
1844	99	16	VMs	vm	NNS
1844	99	17	in	in	IN
1844	99	18	a	a	DT
1844	99	19	private	private	JJ
1844	99	20	cloud	cloud	NN
1844	99	21	environment	environment	NN
1844	99	22	for	for	IN
1844	99	23	this	this	DT
1844	99	24	evaluation	evaluation	NN
1844	99	25	.	.	.
1844	100	1	To	to	TO
1844	100	2	build	build	VB
1844	100	3	and	and	CC
1844	100	4	test	test	VB
1844	100	5	a	a	DT
1844	100	6	hybrid	hybrid	JJ
1844	100	7	cloud	cloud	NN
1844	100	8	environment	environment	NN
1844	100	9	,	,	,
1844	100	10	it	-PRON-	PRP
1844	100	11	was	be	VBD
1844	100	12	necessary	necessary	JJ
1844	100	13	to	to	TO
1844	100	14	access	access	VB
1844	100	15	a	a	DT
1844	100	16	public	public	JJ
1844	100	17	-	-	HYPH
1844	100	18	storage	storage	NN
1844	100	19	cloud	cloud	NN
1844	100	20	(	(	-LRB-
1844	100	21	third	third	JJ
1844	100	22	-	-	HYPH
1844	100	23	party	party	NN
1844	100	24	infrastructure	infrastructure	NN
1844	100	25	)	)	-RRB-
1844	100	26	.	.	.
1844	101	1	We	-PRON-	PRP
1844	101	2	used	use	VBD
1844	101	3	two	two	CD
1844	101	4	public	public	JJ
1844	101	5	storage	storage	NN
1844	101	6	providers	provider	NNS
1844	101	7	in	in	IN
1844	101	8	this	this	DT
1844	101	9	experiment	experiment	NN
1844	101	10	:	:	:
1844	101	11	Dropbox	Dropbox	NNP
1844	101	12	and	and	CC
1844	101	13	Phoenix	Phoenix	NNP
1844	101	14	(	(	-LRB-
1844	101	15	also	also	RB
1844	101	16	known	know	VBN
1844	101	17	as	as	IN
1844	101	18	TreeStore).9	TreeStore).9	NNP
1844	101	19	DAM	DAM	NNP
1844	101	20	also	also	RB
1844	101	21	was	be	VBD
1844	101	22	responsible	responsible	JJ
1844	101	23	for	for	IN
1844	101	24	offering	offer	VBG
1844	101	25	transparent	transparent	JJ
1844	101	26	access	access	NN
1844	101	27	to	to	IN
1844	101	28	the	the	DT
1844	101	29	external	external	JJ
1844	101	30	storage	storage	NN
1844	101	31	infrastructure	infrastructure	NN
1844	101	32	.	.	.
1844	102	1	Both	both	DT
1844	102	2	providers	provider	NNS
1844	102	3	required	require	VBD
1844	102	4	valid	valid	JJ
1844	102	5	user	user	NN
1844	102	6	credentials	credential	NNS
1844	102	7	on	on	IN
1844	102	8	a	a	DT
1844	102	9	per	per	IN
1844	102	10	-	-	HYPH
1844	102	11	request	request	NN
1844	102	12	basis	basis	NN
1844	102	13	.	.	.
1844	103	1	The	the	DT
1844	103	2	Dropbox	Dropbox	NNP
1844	103	3	INFORMATION	INFORMATION	VBD
1844	103	4	TECHNOLOGY	TECHNOLOGY	NNP
1844	103	5	AND	and	CC
1844	103	6	LIBRARIES	LIBRARIES	NNP
1844	103	7	|	|	NNP
1844	103	8	DECEMBER	DECEMBER	NNP
1844	103	9	2012	2012	CD
1844	103	10	39	39	CD
1844	103	11	API	api	NN
1844	103	12	additionally	additionally	RB
1844	103	13	requires	require	VBZ
1844	103	14	a	a	DT
1844	103	15	developer	developer	NN
1844	103	16	key	key	NN
1844	103	17	.	.	.
1844	104	1	It	-PRON-	PRP
1844	104	2	is	be	VBZ
1844	104	3	relevant	relevant	JJ
1844	104	4	to	to	TO
1844	104	5	note	note	VB
1844	104	6	that	that	IN
1844	104	7	Dropbox	Dropbox	NNP
1844	104	8	also	also	RB
1844	104	9	is	be	VBZ
1844	104	10	able	able	JJ
1844	104	11	to	to	TO
1844	104	12	keep	keep	VB
1844	104	13	files	file	NNS
1844	104	14	in	in	IN
1844	104	15	the	the	DT
1844	104	16	Amazon	Amazon	NNP
1844	104	17	S3	S3	NNP
1844	104	18	storage	storage	NN
1844	104	19	infrastructure	infrastructure	NN
1844	104	20	.	.	.
1844	105	1	We	-PRON-	PRP
1844	105	2	emulated	emulate	VBD
1844	105	3	different	different	JJ
1844	105	4	workloads	workload	NNS
1844	105	5	,	,	,
1844	105	6	running	run	VBG
1844	105	7	concurrent	concurrent	JJ
1844	105	8	client	client	NN
1844	105	9	applications	application	NNS
1844	105	10	that	that	WDT
1844	105	11	sent	send	VBD
1844	105	12	many	many	JJ
1844	105	13	parallel	parallel	JJ
1844	105	14	file	file	NN
1844	105	15	upload	upload	JJ
1844	105	16	and	and	CC
1844	105	17	download	download	JJ
1844	105	18	requests	request	NNS
1844	105	19	to	to	IN
1844	105	20	our	-PRON-	PRP$
1844	105	21	cloud	cloud	NN
1844	105	22	-	-	HYPH
1844	105	23	storage	storage	NN
1844	105	24	prototype	prototype	NN
1844	105	25	.	.	.
1844	106	1	The	the	DT
1844	106	2	private	private	JJ
1844	106	3	-	-	HYPH
1844	106	4	storage	storage	NN
1844	106	5	cloud	cloud	NN
1844	106	6	configuration	configuration	NN
1844	106	7	was	be	VBD
1844	106	8	first	first	RB
1844	106	9	tested	test	VBN
1844	106	10	by	by	IN
1844	106	11	receiving	receive	VBG
1844	106	12	50	50	CD
1844	106	13	,	,	,
1844	106	14	100	100	CD
1844	106	15	,	,	,
1844	106	16	and	and	CC
1844	106	17	150	150	CD
1844	106	18	parallel	parallel	JJ
1844	106	19	requests	request	NNS
1844	106	20	.	.	.
1844	107	1	It	-PRON-	PRP
1844	107	2	is	be	VBZ
1844	107	3	worth	worth	JJ
1844	107	4	mentioning	mention	VBG
1844	107	5	that	that	IN
1844	107	6	when	when	WRB
1844	107	7	testing	test	VBG
1844	107	8	the	the	DT
1844	107	9	hybrid	hybrid	JJ
1844	107	10	cloud	cloud	NN
1844	107	11	configuration	configuration	NN
1844	107	12	,	,	,
1844	107	13	it	-PRON-	PRP
1844	107	14	was	be	VBD
1844	107	15	not	not	RB
1844	107	16	possible	possible	JJ
1844	107	17	to	to	TO
1844	107	18	send	send	VB
1844	107	19	the	the	DT
1844	107	20	same	same	JJ
1844	107	21	number	number	NN
1844	107	22	of	of	IN
1844	107	23	parallel	parallel	JJ
1844	107	24	requests	request	NNS
1844	107	25	used	use	VBN
1844	107	26	in	in	IN
1844	107	27	the	the	DT
1844	107	28	private	private	JJ
1844	107	29	configuration	configuration	NN
1844	107	30	.	.	.
1844	108	1	It	-PRON-	PRP
1844	108	2	was	be	VBD
1844	108	3	necessary	necessary	JJ
1844	108	4	to	to	TO
1844	108	5	decrease	decrease	VB
1844	108	6	this	this	DT
1844	108	7	number	number	NN
1844	108	8	because	because	IN
1844	108	9	the	the	DT
1844	108	10	public	public	JJ
1844	108	11	cloud	cloud	NN
1844	108	12	-	-	HYPH
1844	108	13	storage	storage	NN
1844	108	14	providers	provider	NNS
1844	108	15	(	(	-LRB-
1844	108	16	Dropbox	Dropbox	NNP
1844	108	17	and	and	CC
1844	108	18	TreeStore	TreeStore	NNP
1844	108	19	)	)	-RRB-
1844	108	20	could	could	MD
1844	108	21	view	view	VB
1844	108	22	parallel	parallel	JJ
1844	108	23	requests	request	NNS
1844	108	24	of	of	IN
1844	108	25	the	the	DT
1844	108	26	same	same	JJ
1844	108	27	number	number	NN
1844	108	28	as	as	IN
1844	108	29	an	an	DT
1844	108	30	attack	attack	NN
1844	108	31	against	against	IN
1844	108	32	their	-PRON-	PRP$
1844	108	33	servers	server	NNS
1844	108	34	and	and	CC
1844	108	35	,	,	,
1844	108	36	consequently	consequently	RB
1844	108	37	,	,	,
1844	108	38	block	block	VB
1844	108	39	the	the	DT
1844	108	40	service	service	NN
1844	108	41	.	.	.
1844	109	1	Since	since	IN
1844	109	2	we	-PRON-	PRP
1844	109	3	were	be	VBD
1844	109	4	more	more	RBR
1844	109	5	interested	interested	JJ
1844	109	6	in	in	IN
1844	109	7	having	have	VBG
1844	109	8	a	a	DT
1844	109	9	hybrid	hybrid	JJ
1844	109	10	cloud	cloud	NN
1844	109	11	scenario	scenario	NN
1844	109	12	than	than	IN
1844	109	13	in	in	IN
1844	109	14	comparing	compare	VBG
1844	109	15	public	public	NN
1844	109	16	vs.	vs.	IN
1844	109	17	private	private	JJ
1844	109	18	cloud	cloud	NN
1844	109	19	,	,	,
1844	109	20	we	-PRON-	PRP
1844	109	21	decided	decide	VBD
1844	109	22	to	to	TO
1844	109	23	send	send	VB
1844	109	24	only	only	RB
1844	109	25	10	10	CD
1844	109	26	,	,	,
1844	109	27	20	20	CD
1844	109	28	,	,	,
1844	109	29	and	and	CC
1844	109	30	30	30	CD
1844	109	31	parallel	parallel	JJ
1844	109	32	requests	request	NNS
1844	109	33	to	to	IN
1844	109	34	the	the	DT
1844	109	35	public	public	JJ
1844	109	36	storage	storage	NN
1844	109	37	in	in	IN
1844	109	38	the	the	DT
1844	109	39	hybrid	hybrid	JJ
1844	109	40	cloud	cloud	NN
1844	109	41	configuration	configuration	NN
1844	109	42	.	.	.
1844	110	1	The	the	DT
1844	110	2	private	private	JJ
1844	110	3	and	and	CC
1844	110	4	hybrid	hybrid	JJ
1844	110	5	(	(	-LRB-
1844	110	6	private	private	JJ
1844	110	7	+	+	SYM
1844	110	8	public	public	JJ
1844	110	9	)	)	-RRB-
1844	110	10	cloud	cloud	NN
1844	110	11	-	-	HYPH
1844	110	12	storage	storage	NN
1844	110	13	scenario	scenario	NN
1844	110	14	was	be	VBD
1844	110	15	designed	design	VBN
1844	110	16	to	to	TO
1844	110	17	evaluate	evaluate	VB
1844	110	18	the	the	DT
1844	110	19	impact	impact	NN
1844	110	20	of	of	IN
1844	110	21	having	have	VBG
1844	110	22	an	an	DT
1844	110	23	elastic	elastic	JJ
1844	110	24	service	service	NN
1844	110	25	and	and	CC
1844	110	26	the	the	DT
1844	110	27	behavior	behavior	NN
1844	110	28	of	of	IN
1844	110	29	the	the	DT
1844	110	30	cloud-	cloud-	NNP
1844	110	31	storage	storage	NN
1844	110	32	infrastructure	infrastructure	NN
1844	110	33	when	when	WRB
1844	110	34	applying	apply	VBG
1844	110	35	different	different	JJ
1844	110	36	replication	replication	NN
1844	110	37	techniques	technique	NNS
1844	110	38	to	to	TO
1844	110	39	offer	offer	VB
1844	110	40	several	several	JJ
1844	110	41	levels	level	NNS
1844	110	42	of	of	IN
1844	110	43	data	datum	NNS
1844	110	44	availability	availability	NN
1844	110	45	.	.	.
1844	111	1	The	the	DT
1844	111	2	Impact	Impact	NNP
1844	111	3	of	of	IN
1844	111	4	Having	have	VBG
1844	111	5	an	an	DT
1844	111	6	Elastic	Elastic	NNP
1844	111	7	Service	Service	NNP
1844	111	8	This	this	DT
1844	111	9	section	section	NN
1844	111	10	presents	present	VBZ
1844	111	11	a	a	DT
1844	111	12	comparison	comparison	NN
1844	111	13	between	between	IN
1844	111	14	an	an	DT
1844	111	15	elastic	elastic	JJ
1844	111	16	storage	storage	NN
1844	111	17	service	service	NN
1844	111	18	(	(	-LRB-
1844	111	19	using	use	VBG
1844	111	20	virtual	virtual	JJ
1844	111	21	machines	machine	NNS
1844	111	22	)	)	-RRB-
1844	111	23	and	and	CC
1844	111	24	a	a	DT
1844	111	25	fixed	fix	VBN
1844	111	26	storage	storage	NN
1844	111	27	service	service	NN
1844	111	28	(	(	-LRB-
1844	111	29	using	use	VBG
1844	111	30	only	only	RB
1844	111	31	a	a	DT
1844	111	32	physical	physical	JJ
1844	111	33	machine	machine	NN
1844	111	34	)	)	-RRB-
1844	111	35	.	.	.
1844	112	1	In	in	IN
1844	112	2	the	the	DT
1844	112	3	elastic	elastic	JJ
1844	112	4	service	service	NN
1844	112	5	,	,	,
1844	112	6	a	a	DT
1844	112	7	new	new	JJ
1844	112	8	VM	VM	NNP
1844	112	9	is	be	VBZ
1844	112	10	instantiated	instantiate	VBN
1844	112	11	when	when	WRB
1844	112	12	a	a	DT
1844	112	13	workload	workload	NN
1844	112	14	exceeds	exceed	VBZ
1844	112	15	a	a	DT
1844	112	16	defined	define	VBN
1844	112	17	upper	upper	JJ
1844	112	18	threshold	threshold	NN
1844	112	19	.	.	.
1844	113	1	In	in	IN
1844	113	2	the	the	DT
1844	113	3	opposite	opposite	JJ
1844	113	4	situation	situation	NN
1844	113	5	(	(	-LRB-
1844	113	6	when	when	WRB
1844	113	7	the	the	DT
1844	113	8	response	response	NN
1844	113	9	time	time	NN
1844	113	10	is	be	VBZ
1844	113	11	shorter	short	JJR
1844	113	12	than	than	IN
1844	113	13	a	a	DT
1844	113	14	lower	low	JJR
1844	113	15	threshold	threshold	NN
1844	113	16	)	)	-RRB-
1844	113	17	,	,	,
1844	113	18	a	a	DT
1844	113	19	VM	VM	NNP
1844	113	20	is	be	VBZ
1844	113	21	released	release	VBN
1844	113	22	.	.	.
1844	114	1	Several	several	JJ
1844	114	2	response	response	NN
1844	114	3	-	-	HYPH
1844	114	4	time	time	NN
1844	114	5	restrictions	restriction	NNS
1844	114	6	were	be	VBD
1844	114	7	configured	configure	VBN
1844	114	8	during	during	IN
1844	114	9	this	this	DT
1844	114	10	evaluation	evaluation	NN
1844	114	11	to	to	TO
1844	114	12	determine	determine	VB
1844	114	13	the	the	DT
1844	114	14	best	good	JJS
1844	114	15	time	time	NN
1844	114	16	to	to	TO
1844	114	17	instantiate	instantiate	VB
1844	114	18	or	or	CC
1844	114	19	release	release	VB
1844	114	20	a	a	DT
1844	114	21	VM	vm	NN
1844	114	22	.	.	.
1844	115	1	The	the	DT
1844	115	2	evaluation	evaluation	NN
1844	115	3	used	use	VBD
1844	115	4	different	different	JJ
1844	115	5	workloads	workload	NNS
1844	115	6	generated	generate	VBN
1844	115	7	by	by	IN
1844	115	8	Autobench.12	autobench.12	NN
1844	115	9	A	a	DT
1844	115	10	physical	physical	JJ
1844	115	11	machine	machine	NN
1844	115	12	with	with	IN
1844	115	13	a	a	DT
1844	115	14	single	single	JJ
1844	115	15	hard	hard	JJ
1844	115	16	disk	disk	NN
1844	115	17	receiving	receive	VBG
1844	115	18	an	an	DT
1844	115	19	increasing	increase	VBG
1844	115	20	workload	workload	NN
1844	115	21	was	be	VBD
1844	115	22	compared	compare	VBN
1844	115	23	with	with	IN
1844	115	24	the	the	DT
1844	115	25	same	same	JJ
1844	115	26	physical	physical	JJ
1844	115	27	machine	machine	NN
1844	115	28	that	that	WDT
1844	115	29	incrementally	incrementally	RB
1844	115	30	instantiated	instantiate	VBD
1844	115	31	a	a	DT
1844	115	32	set	set	NN
1844	115	33	of	of	IN
1844	115	34	VMs	vm	NNS
1844	115	35	running	run	VBG
1844	115	36	the	the	DT
1844	115	37	same	same	JJ
1844	115	38	workload	workload	NN
1844	115	39	.	.	.
1844	116	1	For	for	IN
1844	116	2	this	this	DT
1844	116	3	test	test	NN
1844	116	4	,	,	,
1844	116	5	the	the	DT
1844	116	6	workload	workload	NN
1844	116	7	consisted	consist	VBD
1844	116	8	of	of	IN
1844	116	9	a	a	DT
1844	116	10	set	set	NN
1844	116	11	of	of	IN
1844	116	12	requests	request	NNS
1844	116	13	of	of	IN
1844	116	14	a	a	DT
1844	116	15	dynamically	dynamically	RB
1844	116	16	generated	generate	VBN
1844	116	17	PHP	PHP	NNP
1844	116	18	webpage	webpage	NN
1844	116	19	.	.	.
1844	117	1	This	this	DT
1844	117	2	webpage	webpage	NN
1844	117	3	emulated	emulate	VBD
1844	117	4	the	the	DT
1844	117	5	processing	processing	NN
1844	117	6	time	time	NN
1844	117	7	on	on	IN
1844	117	8	a	a	DT
1844	117	9	server	server	NN
1844	117	10	by	by	IN
1844	117	11	running	run	VBG
1844	117	12	a	a	DT
1844	117	13	sorting	sort	VBG
1844	117	14	algorithm	algorithm	NN
1844	117	15	(	(	-LRB-
1844	117	16	bubble	bubble	NN
1844	117	17	type	type	NN
1844	117	18	)	)	-RRB-
1844	117	19	.	.	.
1844	118	1	Different	different	JJ
1844	118	2	levels	level	NNS
1844	118	3	of	of	IN
1844	118	4	load	load	NN
1844	118	5	were	be	VBD
1844	118	6	emulated	emulate	VBN
1844	118	7	by	by	IN
1844	118	8	sending	send	VBG
1844	118	9	variable	variable	JJ
1844	118	10	-	-	HYPH
1844	118	11	size	size	NN
1844	118	12	lists	list	NNS
1844	118	13	of	of	IN
1844	118	14	elements	element	NNS
1844	118	15	that	that	WDT
1844	118	16	had	have	VBD
1844	118	17	to	to	TO
1844	118	18	be	be	VB
1844	118	19	sorted	sort	VBN
1844	118	20	by	by	IN
1844	118	21	the	the	DT
1844	118	22	server	server	NN
1844	118	23	process	process	NN
1844	118	24	.	.	.
1844	119	1	The	the	DT
1844	119	2	results	result	NNS
1844	119	3	are	be	VBP
1844	119	4	shown	show	VBN
1844	119	5	in	in	IN
1844	119	6	figure	figure	NN
1844	119	7	2	2	CD
1844	119	8	.	.	.
1844	120	1	The	the	DT
1844	120	2	vertical	vertical	JJ
1844	120	3	axis	axi	NNS
1844	120	4	represents	represent	VBZ
1844	120	5	the	the	DT
1844	120	6	average	average	JJ
1844	120	7	response	response	NN
1844	120	8	time	time	NN
1844	120	9	(	(	-LRB-
1844	120	10	in	in	IN
1844	120	11	seconds	second	NNS
1844	120	12	)	)	-RRB-
1844	120	13	after	after	IN
1844	120	14	sending	send	VBG
1844	120	15	different	different	JJ
1844	120	16	requests	request	NNS
1844	120	17	to	to	IN
1844	120	18	the	the	DT
1844	120	19	storage	storage	NN
1844	120	20	service	service	NN
1844	120	21	.	.	.
1844	121	1	The	the	DT
1844	121	2	horizontal	horizontal	JJ
1844	121	3	axis	axi	NNS
1844	121	4	represents	represent	VBZ
1844	121	5	the	the	DT
1844	121	6	evaluation	evaluation	NN
1844	121	7	time	time	NN
1844	121	8	(	(	-LRB-
1844	121	9	500	500	CD
1844	121	10	seconds	second	NNS
1844	121	11	)	)	-RRB-
1844	121	12	,	,	,
1844	121	13	which	which	WDT
1844	121	14	was	be	VBD
1844	121	15	the	the	DT
1844	121	16	period	period	NN
1844	121	17	of	of	IN
1844	121	18	time	time	NN
1844	121	19	different	different	JJ
1844	121	20	clients	client	NNS
1844	121	21	were	be	VBD
1844	121	22	sending	send	VBG
1844	121	23	requests	request	NNS
1844	121	24	to	to	IN
1844	121	25	the	the	DT
1844	121	26	storage	storage	NN
1844	121	27	service	service	NN
1844	121	28	.	.	.
1844	122	1	The	the	DT
1844	122	2	Fixed	fixed	JJ
1844	122	3	line	line	NN
1844	122	4	indicates	indicate	VBZ
1844	122	5	the	the	DT
1844	122	6	performance	performance	NN
1844	122	7	when	when	WRB
1844	122	8	the	the	DT
1844	122	9	service	service	NN
1844	122	10	load	load	NN
1844	122	11	balancer	balancer	NNP
1844	122	12	accessed	access	VBD
1844	122	13	one	one	CD
1844	122	14	physical	physical	JJ
1844	122	15	machine	machine	NN
1844	122	16	(	(	-LRB-
1844	122	17	i.e.	i.e.	FW
1844	122	18	,	,	,
1844	122	19	the	the	DT
1844	122	20	fixed	fix	VBN
1844	122	21	storage	storage	NN
1844	122	22	service	service	NN
1844	122	23	)	)	-RRB-
1844	122	24	.	.	.
1844	123	1	The	the	DT
1844	123	2	Elastic	elastic	JJ
1844	123	3	line	line	NN
1844	123	4	represents	represent	VBZ
1844	123	5	the	the	DT
1844	123	6	performance	performance	NN
1844	123	7	when	when	WRB
1844	123	8	the	the	DT
1844	123	9	service	service	NN
1844	123	10	load	load	NN
1844	123	11	balancer	balancer	NN
1844	123	12	accessed	access	VBD
1844	123	13	one	one	CD
1844	123	14	to	to	IN
1844	123	15	three	three	CD
1844	123	16	VM	VM	NNP
1844	123	17	instantiations	instantiation	NNS
1844	123	18	in	in	IN
1844	123	19	the	the	DT
1844	123	20	same	same	JJ
1844	123	21	physical	physical	JJ
1844	123	22	machine	machine	NN
1844	123	23	(	(	-LRB-
1844	123	24	i.e.	i.e.	FW
1844	123	25	,	,	,
1844	123	26	the	the	DT
1844	123	27	elastic	elastic	JJ
1844	123	28	service	service	NN
1844	123	29	)	)	-RRB-
1844	123	30	.	.	.
1844	124	1	The	the	DT
1844	124	2	instantiation	instantiation	NN
1844	124	3	and	and	CC
1844	124	4	activation	activation	NN
1844	124	5	time	time	NN
1844	124	6	(	(	-LRB-
1844	124	7	called	call	VBN
1844	124	8	the	the	DT
1844	124	9	Deployment	Deployment	NNP
1844	124	10	time	time	NN
1844	124	11	)	)	-RRB-
1844	124	12	of	of	IN
1844	124	13	a	a	DT
1844	124	14	new	new	JJ
1844	124	15	VM	vm	NN
1844	124	16	was	be	VBD
1844	124	17	between	between	IN
1844	124	18	sixty	sixty	CD
1844	124	19	and	and	CC
1844	124	20	ninety	ninety	CD
1844	124	21	seconds	second	NNS
1844	124	22	.	.	.
1844	125	1	At	at	IN
1844	125	2	the	the	DT
1844	125	3	beginning	beginning	NN
1844	125	4	of	of	IN
1844	125	5	the	the	DT
1844	125	6	test	test	NN
1844	125	7	,	,	,
1844	125	8	when	when	WRB
1844	125	9	the	the	DT
1844	125	10	workload	workload	NN
1844	125	11	is	be	VBZ
1844	125	12	low	low	JJ
1844	125	13	,	,	,
1844	125	14	the	the	DT
1844	125	15	response	response	NN
1844	125	16	time	time	NN
1844	125	17	offered	offer	VBN
1844	125	18	by	by	IN
1844	125	19	the	the	DT
1844	125	20	fixed	fix	VBN
1844	125	21	service	service	NN
1844	125	22	(	(	-LRB-
1844	125	23	running	run	VBG
1844	125	24	only	only	RB
1844	125	25	on	on	IN
1844	125	26	one	one	CD
1844	125	27	physical	physical	JJ
1844	125	28	machine	machine	NN
1844	125	29	)	)	-RRB-
1844	125	30	is	be	VBZ
1844	125	31	better	well	JJR
1844	125	32	—	—	:
1844	125	33	in	in	IN
1844	125	34	some	some	DT
1844	125	35	cases	case	NNS
1844	125	36	up	up	IN
1844	125	37	to	to	IN
1844	125	38	four	four	CD
1844	125	39	or	or	CC
1844	125	40	five	five	CD
1844	125	41	orders	order	NNS
1844	125	42	of	of	IN
1844	125	43	magnitude	magnitude	NN
1844	125	44	—	—	:
1844	125	45	than	than	IN
1844	125	46	that	that	DT
1844	125	47	obtained	obtain	VBN
1844	125	48	in	in	IN
1844	125	49	the	the	DT
1844	125	50	execution	execution	NN
1844	125	51	of	of	IN
1844	125	52	the	the	DT
1844	125	53	service	service	NN
1844	125	54	accessing	access	VBG
1844	125	55	only	only	RB
1844	125	56	one	one	CD
1844	125	57	virtual	virtual	JJ
1844	125	58	A	a	DT
1844	125	59	FILE	FILE	NNP
1844	125	60	STORAGE	STORAGE	NNP
1844	125	61	SERVICE	service	NN
1844	125	62	ON	on	IN
1844	125	63	A	a	DT
1844	125	64	CLOUD	cloud	JJ
1844	125	65	COMPUTING	computing	NN
1844	125	66	ENVIRONMENT	environment	NN
1844	125	67	FOR	for	IN
1844	125	68	DIGITAL	DIGITAL	NNP
1844	125	69	LIBRARIES	library	NNS
1844	125	70	|	|	NNP
1844	125	71	SOSA	SOSA	NNP
1844	125	72	-	-	HYPH
1844	125	73	SOSA	SOSA	NNP
1844	125	74	40	40	CD
1844	125	75	machine	machine	NN
1844	125	76	.	.	.
1844	126	1	However	however	RB
1844	126	2	,	,	,
1844	126	3	the	the	DT
1844	126	4	elastic	elastic	JJ
1844	126	5	service	service	NN
1844	126	6	improved	improve	VBD
1844	126	7	the	the	DT
1844	126	8	response	response	NN
1844	126	9	time	time	NN
1844	126	10	by	by	IN
1844	126	11	including	include	VBG
1844	126	12	more	more	JJR
1844	126	13	VMs	vm	NNS
1844	126	14	in	in	IN
1844	126	15	the	the	DT
1844	126	16	same	same	JJ
1844	126	17	physical	physical	JJ
1844	126	18	machine	machine	NN
1844	126	19	.	.	.
1844	127	1	Figure	figure	NN
1844	127	2	2	2	CD
1844	127	3	.	.	.
1844	128	1	Performance	Performance	NNP
1844	128	2	Comparison	comparison	NN
1844	128	3	between	between	IN
1844	128	4	a	a	DT
1844	128	5	Fixed	fixed	JJ
1844	128	6	and	and	CC
1844	128	7	Elastic	Elastic	NNP
1844	128	8	Storage	Storage	NNP
1844	128	9	Service	Service	NNP
1844	128	10	Response	Response	NNP
1844	128	11	times	time	NNS
1844	128	12	of	of	IN
1844	128	13	fifteen	fifteen	CD
1844	128	14	seconds	second	NNS
1844	128	15	and	and	CC
1844	128	16	five	five	CD
1844	128	17	seconds	second	NNS
1844	128	18	were	be	VBD
1844	128	19	defined	define	VBN
1844	128	20	as	as	IN
1844	128	21	the	the	DT
1844	128	22	upper	upper	JJ
1844	128	23	and	and	CC
1844	128	24	lower	low	JJR
1844	128	25	threshold	threshold	NN
1844	128	26	,	,	,
1844	128	27	respectively	respectively	RB
1844	128	28	.	.	.
1844	129	1	Figure	figure	NN
1844	129	2	2	2	CD
1844	129	3	shows	show	VBZ
1844	129	4	how	how	WRB
1844	129	5	the	the	DT
1844	129	6	response	response	NN
1844	129	7	time	time	NN
1844	129	8	in	in	IN
1844	129	9	the	the	DT
1844	129	10	elastic	elastic	JJ
1844	129	11	service	service	NN
1844	129	12	had	have	VBD
1844	129	13	a	a	DT
1844	129	14	considerable	considerable	JJ
1844	129	15	reduction	reduction	NN
1844	129	16	over	over	IN
1844	129	17	the	the	DT
1844	129	18	course	course	NN
1844	129	19	of	of	IN
1844	129	20	the	the	DT
1844	129	21	test	test	NN
1844	129	22	.	.	.
1844	130	1	This	this	DT
1844	130	2	behavior	behavior	NN
1844	130	3	was	be	VBD
1844	130	4	caused	cause	VBN
1844	130	5	by	by	IN
1844	130	6	the	the	DT
1844	130	7	new	new	JJ
1844	130	8	VMs	vm	NNS
1844	130	9	that	that	WDT
1844	130	10	were	be	VBD
1844	130	11	instantiated	instantiate	VBN
1844	130	12	in	in	IN
1844	130	13	the	the	DT
1844	130	14	storage	storage	NN
1844	130	15	service	service	NN
1844	130	16	and	and	CC
1844	130	17	taken	take	VBN
1844	130	18	into	into	IN
1844	130	19	account	account	NN
1844	130	20	by	by	IN
1844	130	21	the	the	DT
1844	130	22	load	load	NN
1844	130	23	balancer	balancer	NN
1844	130	24	.	.	.
1844	131	1	At	at	IN
1844	131	2	the	the	DT
1844	131	3	end	end	NN
1844	131	4	of	of	IN
1844	131	5	this	this	DT
1844	131	6	evaluation	evaluation	NN
1844	131	7	,	,	,
1844	131	8	the	the	DT
1844	131	9	elastic	elastic	JJ
1844	131	10	service	service	NN
1844	131	11	was	be	VBD
1844	131	12	able	able	JJ
1844	131	13	to	to	TO
1844	131	14	finish	finish	VB
1844	131	15	the	the	DT
1844	131	16	workload	workload	NN
1844	131	17	offering	offer	VBG
1844	131	18	good	good	JJ
1844	131	19	response	response	NN
1844	131	20	times	time	NNS
1844	131	21	,	,	,
1844	131	22	while	while	IN
1844	131	23	the	the	DT
1844	131	24	fixed	fix	VBN
1844	131	25	service	service	NN
1844	131	26	collapsed	collapse	VBD
1844	131	27	and	and	CC
1844	131	28	could	could	MD
1844	131	29	not	not	RB
1844	131	30	finish	finish	VB
1844	131	31	all	all	DT
1844	131	32	of	of	IN
1844	131	33	the	the	DT
1844	131	34	requests	request	NNS
1844	131	35	sent	send	VBN
1844	131	36	by	by	IN
1844	131	37	the	the	DT
1844	131	38	client	client	NN
1844	131	39	.	.	.
1844	132	1	Evaluation	evaluation	NN
1844	132	2	of	of	IN
1844	132	3	Different	different	JJ
1844	132	4	Replication	replication	NN
1844	132	5	Techniques	technique	NNS
1844	132	6	With	with	IN
1844	132	7	DAM	DAM	NNP
1844	132	8	,	,	,
1844	132	9	it	-PRON-	PRP
1844	132	10	is	be	VBZ
1844	132	11	possible	possible	JJ
1844	132	12	to	to	TO
1844	132	13	define	define	VB
1844	132	14	the	the	DT
1844	132	15	level	level	NN
1844	132	16	of	of	IN
1844	132	17	data	datum	NNS
1844	132	18	availability	availability	NN
1844	132	19	in	in	IN
1844	132	20	the	the	DT
1844	132	21	cloud	cloud	NN
1844	132	22	-	-	HYPH
1844	132	23	storage	storage	NN
1844	132	24	prototype	prototype	NN
1844	132	25	by	by	IN
1844	132	26	applying	apply	VBG
1844	132	27	different	different	JJ
1844	132	28	replication	replication	NN
1844	132	29	techniques	technique	NNS
1844	132	30	.	.	.
1844	133	1	We	-PRON-	PRP
1844	133	2	defined	define	VBD
1844	133	3	a	a	DT
1844	133	4	benchmark	benchmark	NN
1844	133	5	to	to	TO
1844	133	6	evaluate	evaluate	VB
1844	133	7	the	the	DT
1844	133	8	benefits	benefit	NNS
1844	133	9	when	when	WRB
1844	133	10	using	use	VBG
1844	133	11	a	a	DT
1844	133	12	distributed	distribute	VBN
1844	133	13	storage	storage	NN
1844	133	14	system	system	NN
1844	133	15	compared	compare	VBN
1844	133	16	with	with	IN
1844	133	17	a	a	DT
1844	133	18	centralized	centralized	JJ
1844	133	19	version	version	NN
1844	133	20	.	.	.
1844	134	1	In	in	IN
1844	134	2	the	the	DT
1844	134	3	centralized	centralized	JJ
1844	134	4	version	version	NN
1844	134	5	,	,	,
1844	134	6	DAM	DAM	NNP
1844	134	7	had	have	VBD
1844	134	8	access	access	NN
1844	134	9	to	to	IN
1844	134	10	a	a	DT
1844	134	11	single	single	JJ
1844	134	12	disk	disk	NN
1844	134	13	using	use	VBG
1844	134	14	only	only	RB
1844	134	15	one	one	CD
1844	134	16	VM	VM	NNP
1844	134	17	(	(	-LRB-
1844	134	18	emulating	emulate	VBG
1844	134	19	a	a	DT
1844	134	20	centralized	centralized	JJ
1844	134	21	process	process	NN
1844	134	22	)	)	-RRB-
1844	134	23	with	with	IN
1844	134	24	a	a	DT
1844	134	25	single	single	JJ
1844	134	26	file	file	NN
1844	134	27	server	server	NN
1844	134	28	(	(	-LRB-
1844	134	29	emulating	emulate	VBG
1844	134	30	centralized	centralize	VBN
1844	134	31	storage	storage	NN
1844	134	32	)	)	-RRB-
1844	134	33	.	.	.
1844	135	1	The	the	DT
1844	135	2	distributed	distribute	VBN
1844	135	3	version	version	NN
1844	135	4	considered	consider	VBD
1844	135	5	the	the	DT
1844	135	6	use	use	NN
1844	135	7	of	of	IN
1844	135	8	distributed	distribute	VBN
1844	135	9	processes	process	NNS
1844	135	10	(	(	-LRB-
1844	135	11	eight	eight	CD
1844	135	12	VMs	vm	NNS
1844	135	13	)	)	-RRB-
1844	135	14	accessing	access	VBG
1844	135	15	a	a	DT
1844	135	16	distributed	distribute	VBN
1844	135	17	storage	storage	NN
1844	135	18	system	system	NN
1844	135	19	(	(	-LRB-
1844	135	20	five	five	CD
1844	135	21	disks	disk	NNS
1844	135	22	distributed	distribute	VBN
1844	135	23	on	on	IN
1844	135	24	different	different	JJ
1844	135	25	storage	storage	NN
1844	135	26	servers	server	NNS
1844	135	27	encapsulated	encapsulate	VBN
1844	135	28	by	by	IN
1844	135	29	DAM	DAM	NNP
1844	135	30	)	)	-RRB-
1844	135	31	.	.	.
1844	136	1	Since	since	IN
1844	136	2	the	the	DT
1844	136	3	replication	replication	NN
1844	136	4	with	with	IN
1844	136	5	the	the	DT
1844	136	6	IDA	IDA	NNP
1844	136	7	technique	technique	NN
1844	136	8	is	be	VBZ
1844	136	9	attractive	attractive	JJ
1844	136	10	for	for	IN
1844	136	11	a	a	DT
1844	136	12	hybrid	hybrid	JJ
1844	136	13	cloud	cloud	NN
1844	136	14	service	service	NN
1844	136	15	,	,	,
1844	136	16	its	-PRON-	PRP$
1844	136	17	behavior	behavior	NN
1844	136	18	was	be	VBD
1844	136	19	compared	compare	VBN
1844	136	20	in	in	IN
1844	136	21	both	both	DT
1844	136	22	cases	case	NNS
1844	136	23	:	:	:
1844	136	24	when	when	WRB
1844	136	25	it	-PRON-	PRP
1844	136	26	is	be	VBZ
1844	136	27	only	only	RB
1844	136	28	accessing	access	VBG
1844	136	29	a	a	DT
1844	136	30	private	private	JJ
1844	136	31	storage	storage	NN
1844	136	32	cloud	cloud	NN
1844	136	33	and	and	CC
1844	136	34	when	when	WRB
1844	136	35	it	-PRON-	PRP
1844	136	36	is	be	VBZ
1844	136	37	accessing	access	VBG
1844	136	38	both	both	CC
1844	136	39	a	a	DT
1844	136	40	private	private	JJ
1844	136	41	and	and	CC
1844	136	42	a	a	DT
1844	136	43	public	public	JJ
1844	136	44	storage	storage	NN
1844	136	45	cloud	cloud	NN
1844	136	46	(	(	-LRB-
1844	136	47	hybrid	hybrid	NNP
1844	136	48	model	model	NN
1844	136	49	)	)	-RRB-
1844	136	50	.	.	.
1844	137	1	Two	two	CD
1844	137	2	main	main	JJ
1844	137	3	metrics	metric	NNS
1844	137	4	were	be	VBD
1844	137	5	taken	take	VBN
1844	137	6	into	into	IN
1844	137	7	account	account	NN
1844	137	8	for	for	IN
1844	137	9	these	these	DT
1844	137	10	experiments	experiment	NNS
1844	137	11	.	.	.
1844	138	1	The	the	DT
1844	138	2	first	first	JJ
1844	138	3	was	be	VBD
1844	138	4	response	response	NN
1844	138	5	time	time	NN
1844	138	6	,	,	,
1844	138	7	the	the	DT
1844	138	8	time	time	NN
1844	138	9	from	from	IN
1844	138	10	when	when	WRB
1844	138	11	the	the	DT
1844	138	12	user	user	NN
1844	138	13	clicks	click	VBZ
1844	138	14	on	on	IN
1844	138	15	the	the	DT
1844	138	16	button	button	NN
1844	138	17	to	to	TO
1844	138	18	upload	upload	VB
1844	138	19	or	or	CC
1844	138	20	download	download	VB
1844	138	21	a	a	DT
1844	138	22	file	file	NN
1844	138	23	to	to	IN
1844	138	24	when	when	WRB
1844	138	25	the	the	DT
1844	138	26	file	file	NN
1844	138	27	loading	loading	NN
1844	138	28	or	or	CC
1844	138	29	downloading	downloading	NN
1844	138	30	has	have	VBZ
1844	138	31	finished	finish	VBN
1844	138	32	—	—	:
1844	138	33	in	in	IN
1844	138	34	this	this	DT
1844	138	35	test	test	NN
1844	138	36	until	until	IN
1844	138	37	the	the	DT
1844	138	38	TCP	TCP	NNP
1844	138	39	connection	connection	NN
1844	138	40	is	be	VBZ
1844	138	41	closed	close	VBN
1844	138	42	.	.	.
1844	139	1	The	the	DT
1844	139	2	second	second	JJ
1844	139	3	INFORMATION	information	NN
1844	139	4	TECHNOLOGY	TECHNOLOGY	NNP
1844	139	5	AND	and	CC
1844	139	6	LIBRARIES	LIBRARIES	NNP
1844	139	7	|	|	NNP
1844	139	8	DECEMBER	DECEMBER	NNP
1844	139	9	2012	2012	CD
1844	139	10	41	41	CD
1844	139	11	was	be	VBD
1844	139	12	service	service	NN
1844	139	13	time	time	NN
1844	139	14	,	,	,
1844	139	15	the	the	DT
1844	139	16	time	time	NN
1844	139	17	needed	need	VBN
1844	139	18	by	by	IN
1844	139	19	DAM	DAM	NNP
1844	139	20	to	to	TO
1844	139	21	locate	locate	VB
1844	139	22	a	a	DT
1844	139	23	file	file	NN
1844	139	24	(	(	-LRB-
1844	139	25	or	or	CC
1844	139	26	part	part	NN
1844	139	27	of	of	IN
1844	139	28	it	-PRON-	PRP
1844	139	29	)	)	-RRB-
1844	139	30	and	and	CC
1844	139	31	prepare	prepare	VB
1844	139	32	the	the	DT
1844	139	33	file	file	NN
1844	139	34	to	to	TO
1844	139	35	be	be	VB
1844	139	36	read	read	VBN
1844	139	37	by	by	IN
1844	139	38	the	the	DT
1844	139	39	system	system	NN
1844	139	40	component	component	NN
1844	139	41	that	that	WDT
1844	139	42	is	be	VBZ
1844	139	43	requesting	request	VBG
1844	139	44	it	-PRON-	PRP
1844	139	45	.	.	.
1844	140	1	Replication	Replication	NNP
1844	140	2	Techniques	Techniques	NNPS
1844	140	3	in	in	IN
1844	140	4	a	a	DT
1844	140	5	Private	private	JJ
1844	140	6	Cloud	Cloud	NNP
1844	140	7	This	this	DT
1844	140	8	test	test	NN
1844	140	9	evaluated	evaluate	VBD
1844	140	10	the	the	DT
1844	140	11	storage	storage	NN
1844	140	12	service	service	NN
1844	140	13	response	response	NN
1844	140	14	and	and	CC
1844	140	15	service	service	NN
1844	140	16	time	time	NN
1844	140	17	using	use	VBG
1844	140	18	different	different	JJ
1844	140	19	levels	level	NNS
1844	140	20	of	of	IN
1844	140	21	data	datum	NNS
1844	140	22	availability	availability	NN
1844	140	23	and	and	CC
1844	140	24	fault	fault	NN
1844	140	25	tolerance	tolerance	NN
1844	140	26	on	on	IN
1844	140	27	a	a	DT
1844	140	28	private	private	JJ
1844	140	29	cloud	cloud	NN
1844	140	30	environment	environment	NN
1844	140	31	.	.	.
1844	141	1	We	-PRON-	PRP
1844	141	2	implemented	implement	VBD
1844	141	3	different	different	JJ
1844	141	4	replication	replication	NN
1844	141	5	techniques	technique	NNS
1844	141	6	in	in	IN
1844	141	7	DAM	DAM	NNP
1844	141	8	to	to	TO
1844	141	9	carry	carry	VB
1844	141	10	out	out	RP
1844	141	11	this	this	DT
1844	141	12	task	task	NN
1844	141	13	.	.	.
1844	142	1	The	the	DT
1844	142	2	left	left	JJ
1844	142	3	side	side	NN
1844	142	4	of	of	IN
1844	142	5	the	the	DT
1844	142	6	figure	figure	NN
1844	142	7	3	3	CD
1844	142	8	shows	show	VBZ
1844	142	9	the	the	DT
1844	142	10	response	response	NN
1844	142	11	and	and	CC
1844	142	12	service	service	NN
1844	142	13	time	time	NN
1844	142	14	produced	produce	VBN
1844	142	15	by	by	IN
1844	142	16	different	different	JJ
1844	142	17	replication	replication	NN
1844	142	18	techniques	technique	NNS
1844	142	19	during	during	IN
1844	142	20	the	the	DT
1844	142	21	file	file	NN
1844	142	22	uploading	uploading	NN
1844	142	23	process	process	NN
1844	142	24	.	.	.
1844	143	1	In	in	IN
1844	143	2	this	this	DT
1844	143	3	case	case	NN
1844	143	4	,	,	,
1844	143	5	even	even	RB
1844	143	6	though	though	IN
1844	143	7	the	the	DT
1844	143	8	total	total	JJ
1844	143	9	replication	replication	NN
1844	143	10	technique	technique	NN
1844	143	11	had	have	VBD
1844	143	12	a	a	DT
1844	143	13	poor	poor	JJ
1844	143	14	service	service	NN
1844	143	15	time	time	NN
1844	143	16	,	,	,
1844	143	17	the	the	DT
1844	143	18	storage	storage	NN
1844	143	19	service	service	NN
1844	143	20	showed	show	VBD
1844	143	21	its	-PRON-	PRP$
1844	143	22	worst	bad	JJS
1844	143	23	performance	performance	NN
1844	143	24	when	when	WRB
1844	143	25	implementing	implement	VBG
1844	143	26	a	a	DT
1844	143	27	centralized	centralized	JJ
1844	143	28	architecture	architecture	NN
1844	143	29	.	.	.
1844	144	1	It	-PRON-	PRP
1844	144	2	is	be	VBZ
1844	144	3	interesting	interesting	JJ
1844	144	4	to	to	TO
1844	144	5	see	see	VB
1844	144	6	how	how	WRB
1844	144	7	the	the	DT
1844	144	8	no	no	DT
1844	144	9	-	-	HYPH
1844	144	10	replication	replication	NN
1844	144	11	technique	technique	NN
1844	144	12	is	be	VBZ
1844	144	13	showing	show	VBG
1844	144	14	the	the	DT
1844	144	15	best	good	JJS
1844	144	16	performance	performance	NN
1844	144	17	during	during	IN
1844	144	18	the	the	DT
1844	144	19	uploading	uploading	JJ
1844	144	20	process	process	NN
1844	144	21	.	.	.
1844	145	1	This	this	DT
1844	145	2	behavior	behavior	NN
1844	145	3	may	may	MD
1844	145	4	exist	exist	VB
1844	145	5	because	because	IN
1844	145	6	this	this	DT
1844	145	7	technique	technique	NN
1844	145	8	does	do	VBZ
1844	145	9	not	not	RB
1844	145	10	require	require	VB
1844	145	11	any	any	DT
1844	145	12	additional	additional	JJ
1844	145	13	work	work	NN
1844	145	14	for	for	IN
1844	145	15	replicating	replicate	VBG
1844	145	16	a	a	DT
1844	145	17	file	file	NN
1844	145	18	and	and	CC
1844	145	19	does	do	VBZ
1844	145	20	not	not	RB
1844	145	21	have	have	VB
1844	145	22	to	to	TO
1844	145	23	send	send	VB
1844	145	24	any	any	DT
1844	145	25	additional	additional	JJ
1844	145	26	data	datum	NNS
1844	145	27	through	through	IN
1844	145	28	the	the	DT
1844	145	29	network	network	NN
1844	145	30	.	.	.
1844	146	1	Figure	figure	NN
1844	146	2	3	3	CD
1844	146	3	.	.	.
1844	147	1	Average	average	JJ
1844	147	2	Response	Response	NNP
1844	147	3	and	and	CC
1844	147	4	Service	Service	NNP
1844	147	5	Time	Time	NNP
1844	147	6	for	for	IN
1844	147	7	File	File	NNP
1844	147	8	Uploading	Uploading	NNP
1844	147	9	(	(	-LRB-
1844	147	10	FU	FU	NNP
1844	147	11	)	)	-RRB-
1844	147	12	and	and	CC
1844	147	13	Downloading	Downloading	NNP
1844	147	14	(	(	-LRB-
1844	147	15	FD	FD	NNP
1844	147	16	)	)	-RRB-
1844	147	17	using	use	VBG
1844	147	18	Different	different	JJ
1844	147	19	Replication	Replication	NNP
1844	147	20	Techniques	Techniques	NNPS
1844	147	21	in	in	IN
1844	147	22	a	a	DT
1844	147	23	Private	private	JJ
1844	147	24	Cloud	Cloud	NNP
1844	147	25	Environment	Environment	NNP
1844	147	26	The	the	DT
1844	147	27	right	right	JJ
1844	147	28	side	side	NN
1844	147	29	of	of	IN
1844	147	30	figure	figure	NN
1844	147	31	3	3	CD
1844	147	32	shows	show	VBZ
1844	147	33	the	the	DT
1844	147	34	response	response	NN
1844	147	35	and	and	CC
1844	147	36	service	service	NN
1844	147	37	time	time	NN
1844	147	38	perceived	perceive	VBN
1844	147	39	during	during	IN
1844	147	40	the	the	DT
1844	147	41	file	file	NN
1844	147	42	downloading	downloading	NN
1844	147	43	process	process	NN
1844	147	44	using	use	VBG
1844	147	45	the	the	DT
1844	147	46	private	private	JJ
1844	147	47	cloud	cloud	NN
1844	147	48	.	.	.
1844	148	1	In	in	IN
1844	148	2	this	this	DT
1844	148	3	case	case	NN
1844	148	4	,	,	,
1844	148	5	even	even	RB
1844	148	6	though	though	IN
1844	148	7	the	the	DT
1844	148	8	IDA	IDA	NNP
1844	148	9	technique	technique	NN
1844	148	10	is	be	VBZ
1844	148	11	producing	produce	VBG
1844	148	12	the	the	DT
1844	148	13	worst	bad	JJS
1844	148	14	service	service	NN
1844	148	15	time	time	NN
1844	148	16	,	,	,
1844	148	17	the	the	DT
1844	148	18	response	response	NN
1844	148	19	time	time	NN
1844	148	20	showed	show	VBN
1844	148	21	by	by	IN
1844	148	22	the	the	DT
1844	148	23	different	different	JJ
1844	148	24	replication	replication	NN
1844	148	25	techniques	technique	NNS
1844	148	26	was	be	VBD
1844	148	27	similar	similar	JJ
1844	148	28	.	.	.
1844	149	1	The	the	DT
1844	149	2	IDA	IDA	NNP
1844	149	3	shows	show	VBZ
1844	149	4	a	a	DT
1844	149	5	competitive	competitive	JJ
1844	149	6	response	response	NN
1844	149	7	time	time	NN
1844	149	8	and	and	CC
1844	149	9	offers	offer	VBZ
1844	149	10	an	an	DT
1844	149	11	acceptable	acceptable	JJ
1844	149	12	level	level	NN
1844	149	13	of	of	IN
1844	149	14	fault	fault	NN
1844	149	15	tolerance	tolerance	NN
1844	149	16	.	.	.
1844	150	1	The	the	DT
1844	150	2	total	total	JJ
1844	150	3	replication	replication	NN
1844	150	4	technique	technique	NN
1844	150	5	offers	offer	VBZ
1844	150	6	high	high	JJ
1844	150	7	data	datum	NNS
1844	150	8	availability	availability	NN
1844	150	9	and	and	CC
1844	150	10	fault	fault	NN
1844	150	11	tolerance	tolerance	NN
1844	150	12	,	,	,
1844	150	13	but	but	CC
1844	150	14	it	-PRON-	PRP
1844	150	15	is	be	VBZ
1844	150	16	not	not	RB
1844	150	17	producing	produce	VBG
1844	150	18	the	the	DT
1844	150	19	best	good	JJS
1844	150	20	response	response	NN
1844	150	21	time	time	NN
1844	150	22	.	.	.
1844	151	1	This	this	DT
1844	151	2	slowness	slowness	NN
1844	151	3	could	could	MD
1844	151	4	be	be	VB
1844	151	5	because	because	IN
1844	151	6	the	the	DT
1844	151	7	way	way	NN
1844	151	8	DAM	DAM	NNP
1844	151	9	is	be	VBZ
1844	151	10	managing	manage	VBG
1844	151	11	the	the	DT
1844	151	12	distributed	distribute	VBN
1844	151	13	disk	disk	NN
1844	151	14	pool	pool	NN
1844	151	15	.	.	.
1844	152	1	It	-PRON-	PRP
1844	152	2	is	be	VBZ
1844	152	3	important	important	JJ
1844	152	4	to	to	TO
1844	152	5	note	note	VB
1844	152	6	that	that	IN
1844	152	7	this	this	DT
1844	152	8	replication	replication	NN
1844	152	9	technique	technique	NN
1844	152	10	produces	produce	VBZ
1844	152	11	the	the	DT
1844	152	12	highest	high	JJS
1844	152	13	storage	storage	NN
1844	152	14	consumption	consumption	NN
1844	152	15	.	.	.
1844	153	1	A	a	DT
1844	153	2	FILE	FILE	NNP
1844	153	3	STORAGE	STORAGE	NNP
1844	153	4	SERVICE	service	NN
1844	153	5	ON	on	IN
1844	153	6	A	a	DT
1844	153	7	CLOUD	cloud	JJ
1844	153	8	COMPUTING	computing	NN
1844	153	9	ENVIRONMENT	environment	NN
1844	153	10	FOR	for	IN
1844	153	11	DIGITAL	DIGITAL	NNP
1844	153	12	LIBRARIES	library	NNS
1844	153	13	|	|	NNP
1844	153	14	SOSA	SOSA	NNP
1844	153	15	-	-	HYPH
1844	153	16	SOSA	SOSA	NNP
1844	153	17	42	42	CD
1844	153	18	Replication	Replication	NNP
1844	153	19	Techniques	Techniques	NNPS
1844	153	20	in	in	IN
1844	153	21	a	a	DT
1844	153	22	Hybrid	Hybrid	NNP
1844	153	23	Cloud	Cloud	NNP
1844	153	24	The	the	DT
1844	153	25	aim	aim	NN
1844	153	26	of	of	IN
1844	153	27	this	this	DT
1844	153	28	test	test	NN
1844	153	29	was	be	VBD
1844	153	30	to	to	TO
1844	153	31	evaluate	evaluate	VB
1844	153	32	the	the	DT
1844	153	33	behavior	behavior	NN
1844	153	34	of	of	IN
1844	153	35	the	the	DT
1844	153	36	IDA	IDA	NNP
1844	153	37	replication	replication	NN
1844	153	38	technique	technique	NN
1844	153	39	implemented	implement	VBN
1844	153	40	in	in	IN
1844	153	41	a	a	DT
1844	153	42	hybrid	hybrid	JJ
1844	153	43	cloud	cloud	NN
1844	153	44	(	(	-LRB-
1844	153	45	accessing	access	VBG
1844	153	46	both	both	CC
1844	153	47	private	private	JJ
1844	153	48	and	and	CC
1844	153	49	public	public	JJ
1844	153	50	cloud	cloud	NN
1844	153	51	infrastructures	infrastructure	NNS
1844	153	52	)	)	-RRB-
1844	153	53	.	.	.
1844	154	1	In	in	IN
1844	154	2	this	this	DT
1844	154	3	context	context	NN
1844	154	4	,	,	,
1844	154	5	we	-PRON-	PRP
1844	154	6	generated	generate	VBD
1844	154	7	fewer	few	JJR
1844	154	8	requests	request	NNS
1844	154	9	than	than	IN
1844	154	10	we	-PRON-	PRP
1844	154	11	originally	originally	RB
1844	154	12	planned	plan	VBD
1844	154	13	because	because	IN
1844	154	14	of	of	IN
1844	154	15	restrictions	restriction	NNS
1844	154	16	made	make	VBN
1844	154	17	by	by	IN
1844	154	18	the	the	DT
1844	154	19	public	public	JJ
1844	154	20	storage	storage	NN
1844	154	21	providers	provider	NNS
1844	154	22	.	.	.
1844	155	1	It	-PRON-	PRP
1844	155	2	is	be	VBZ
1844	155	3	important	important	JJ
1844	155	4	to	to	TO
1844	155	5	note	note	VB
1844	155	6	that	that	IN
1844	155	7	the	the	DT
1844	155	8	IDA	IDA	NNP
1844	155	9	technique	technique	NN
1844	155	10	could	could	MD
1844	155	11	be	be	VB
1844	155	12	attractive	attractive	JJ
1844	155	13	in	in	IN
1844	155	14	hybrid	hybrid	JJ
1844	155	15	cloud	cloud	NN
1844	155	16	storage	storage	NN
1844	155	17	.	.	.
1844	156	1	The	the	DT
1844	156	2	IDA	IDA	NNP
1844	156	3	offers	offer	VBZ
1844	156	4	data	datum	NNS
1844	156	5	availability	availability	NN
1844	156	6	,	,	,
1844	156	7	fault	fault	NN
1844	156	8	tolerance	tolerance	NN
1844	156	9	,	,	,
1844	156	10	and	and	CC
1844	156	11	a	a	DT
1844	156	12	certain	certain	JJ
1844	156	13	level	level	NN
1844	156	14	of	of	IN
1844	156	15	privacy	privacy	NN
1844	156	16	because	because	IN
1844	156	17	it	-PRON-	PRP
1844	156	18	does	do	VBZ
1844	156	19	not	not	RB
1844	156	20	require	require	VB
1844	156	21	a	a	DT
1844	156	22	copy	copy	NN
1844	156	23	of	of	IN
1844	156	24	a	a	DT
1844	156	25	complete	complete	JJ
1844	156	26	file	file	NN
1844	156	27	to	to	TO
1844	156	28	be	be	VB
1844	156	29	sent	send	VBN
1844	156	30	to	to	IN
1844	156	31	the	the	DT
1844	156	32	public	public	JJ
1844	156	33	cloud	cloud	NN
1844	156	34	storage	storage	NN
1844	156	35	.	.	.
1844	157	1	In	in	IN
1844	157	2	this	this	DT
1844	157	3	context	context	NN
1844	157	4	,	,	,
1844	157	5	we	-PRON-	PRP
1844	157	6	compared	compare	VBD
1844	157	7	the	the	DT
1844	157	8	response	response	NN
1844	157	9	and	and	CC
1844	157	10	service	service	NN
1844	157	11	times	time	NNS
1844	157	12	during	during	IN
1844	157	13	the	the	DT
1844	157	14	file	file	NN
1844	157	15	uploading	upload	VBG
1844	157	16	and	and	CC
1844	157	17	downloading	download	VBG
1844	157	18	processes	process	NNS
1844	157	19	.	.	.
1844	158	1	The	the	DT
1844	158	2	performance	performance	NN
1844	158	3	of	of	IN
1844	158	4	the	the	DT
1844	158	5	version	version	NN
1844	158	6	of	of	IN
1844	158	7	the	the	DT
1844	158	8	IDA	IDA	NNP
1844	158	9	implemented	implement	VBN
1844	158	10	in	in	IN
1844	158	11	the	the	DT
1844	158	12	private	private	JJ
1844	158	13	cloud	cloud	NN
1844	158	14	is	be	VBZ
1844	158	15	taken	take	VBN
1844	158	16	as	as	IN
1844	158	17	a	a	DT
1844	158	18	reference	reference	NN
1844	158	19	point	point	NN
1844	158	20	.	.	.
1844	159	1	We	-PRON-	PRP
1844	159	2	compared	compare	VBD
1844	159	3	the	the	DT
1844	159	4	private	private	JJ
1844	159	5	version	version	NN
1844	159	6	two	two	CD
1844	159	7	IDA	IDA	NNP
1844	159	8	versions	version	NNS
1844	159	9	that	that	WDT
1844	159	10	access	access	VBP
1844	159	11	each	each	DT
1844	159	12	public	public	JJ
1844	159	13	cloud	cloud	NN
1844	159	14	storage	storage	NN
1844	159	15	provider	provider	NN
1844	159	16	,	,	,
1844	159	17	Dropbox	Dropbox	NNP
1844	159	18	and	and	CC
1844	159	19	Phoenix	Phoenix	NNP
1844	159	20	(	(	-LRB-
1844	159	21	TreeStore	TreeStore	NNP
1844	159	22	)	)	-RRB-
1844	159	23	.	.	.
1844	160	1	The	the	DT
1844	160	2	left	left	JJ
1844	160	3	side	side	NN
1844	160	4	of	of	IN
1844	160	5	figure	figure	NN
1844	160	6	4	4	CD
1844	160	7	shows	show	VBZ
1844	160	8	the	the	DT
1844	160	9	response	response	NN
1844	160	10	and	and	CC
1844	160	11	service	service	NN
1844	160	12	time	time	NN
1844	160	13	during	during	IN
1844	160	14	the	the	DT
1844	160	15	uploading	uploading	JJ
1844	160	16	process	process	NN
1844	160	17	.	.	.
1844	161	1	The	the	DT
1844	161	2	figure	figure	NN
1844	161	3	shows	show	VBZ
1844	161	4	that	that	IN
1844	161	5	the	the	DT
1844	161	6	IDA	IDA	NNP
1844	161	7	suffers	suffer	VBZ
1844	161	8	a	a	DT
1844	161	9	high	high	JJ
1844	161	10	penalty	penalty	NN
1844	161	11	when	when	WRB
1844	161	12	accessing	access	VBG
1844	161	13	external	external	JJ
1844	161	14	storage	storage	NN
1844	161	15	(	(	-LRB-
1844	161	16	up	up	IN
1844	161	17	to	to	TO
1844	161	18	ten	ten	CD
1844	161	19	orders	order	NNS
1844	161	20	of	of	IN
1844	161	21	magnitude	magnitude	NN
1844	161	22	)	)	-RRB-
1844	161	23	.	.	.
1844	162	1	Even	even	RB
1844	162	2	when	when	WRB
1844	162	3	the	the	DT
1844	162	4	downloading	downloading	NN
1844	162	5	process	process	NN
1844	162	6	(	(	-LRB-
1844	162	7	right	right	JJ
1844	162	8	side	side	NN
1844	162	9	of	of	IN
1844	162	10	figure	figure	NN
1844	162	11	4	4	CD
1844	162	12	)	)	-RRB-
1844	162	13	showed	show	VBD
1844	162	14	better	well	JJR
1844	162	15	performance	performance	NN
1844	162	16	,	,	,
1844	162	17	the	the	DT
1844	162	18	response	response	NN
1844	162	19	time	time	NN
1844	162	20	of	of	IN
1844	162	21	the	the	DT
1844	162	22	IDA	IDA	NNP
1844	162	23	is	be	VBZ
1844	162	24	still	still	RB
1844	162	25	penalized	penalize	VBN
1844	162	26	when	when	WRB
1844	162	27	accessing	access	VBG
1844	162	28	external	external	JJ
1844	162	29	storage	storage	NN
1844	162	30	in	in	IN
1844	162	31	range	range	NN
1844	162	32	of	of	IN
1844	162	33	six	six	CD
1844	162	34	or	or	CC
1844	162	35	seven	seven	CD
1844	162	36	orders	order	NNS
1844	162	37	of	of	IN
1844	162	38	magnitude	magnitude	NN
1844	162	39	.	.	.
1844	163	1	This	this	DT
1844	163	2	penalty	penalty	NN
1844	163	3	on	on	IN
1844	163	4	the	the	DT
1844	163	5	IDA	IDA	NNP
1844	163	6	version	version	NN
1844	163	7	in	in	IN
1844	163	8	a	a	DT
1844	163	9	hybrid	hybrid	JJ
1844	163	10	environment	environment	NN
1844	163	11	mainly	mainly	RB
1844	163	12	is	be	VBZ
1844	163	13	caused	cause	VBN
1844	163	14	,	,	,
1844	163	15	we	-PRON-	PRP
1844	163	16	think	think	VBP
1844	163	17	,	,	,
1844	163	18	by	by	IN
1844	163	19	a	a	DT
1844	163	20	poor	poor	JJ
1844	163	21	Internet	internet	NN
1844	163	22	connection	connection	NN
1844	163	23	(	(	-LRB-
1844	163	24	it	-PRON-	PRP
1844	163	25	is	be	VBZ
1844	163	26	not	not	RB
1844	163	27	a	a	DT
1844	163	28	dedicated	dedicated	JJ
1844	163	29	link	link	NN
1844	163	30	)	)	-RRB-
1844	163	31	used	use	VBN
1844	163	32	to	to	TO
1844	163	33	send	send	VB
1844	163	34	and	and	CC
1844	163	35	receive	receive	VB
1844	163	36	file	file	NN
1844	163	37	fragments	fragment	NNS
1844	163	38	from	from	IN
1844	163	39	the	the	DT
1844	163	40	external	external	JJ
1844	163	41	infrastructure	infrastructure	NN
1844	163	42	(	(	-LRB-
1844	163	43	storage	storage	NN
1844	163	44	providers	provider	NNS
1844	163	45	)	)	-RRB-
1844	163	46	.	.	.
1844	164	1	It	-PRON-	PRP
1844	164	2	is	be	VBZ
1844	164	3	worth	worth	JJ
1844	164	4	keeping	keep	VBG
1844	164	5	in	in	IN
1844	164	6	mind	mind	NN
1844	164	7	that	that	IN
1844	164	8	one	one	CD
1844	164	9	of	of	IN
1844	164	10	the	the	DT
1844	164	11	benefits	benefit	NNS
1844	164	12	of	of	IN
1844	164	13	storing	store	VBG
1844	164	14	some	some	DT
1844	164	15	file	file	NN
1844	164	16	fragments	fragment	NNS
1844	164	17	in	in	IN
1844	164	18	the	the	DT
1844	164	19	external	external	JJ
1844	164	20	infrastructure	infrastructure	NN
1844	164	21	is	be	VBZ
1844	164	22	having	have	VBG
1844	164	23	more	more	JJR
1844	164	24	storage	storage	NN
1844	164	25	space	space	NN
1844	164	26	available	available	JJ
1844	164	27	in	in	IN
1844	164	28	the	the	DT
1844	164	29	private	private	JJ
1844	164	30	cloud	cloud	NN
1844	164	31	.	.	.
1844	165	1	It	-PRON-	PRP
1844	165	2	also	also	RB
1844	165	3	is	be	VBZ
1844	165	4	important	important	JJ
1844	165	5	to	to	TO
1844	165	6	remember	remember	VB
1844	165	7	that	that	IN
1844	165	8	,	,	,
1844	165	9	for	for	IN
1844	165	10	security	security	NN
1844	165	11	reasons	reason	NNS
1844	165	12	,	,	,
1844	165	13	the	the	DT
1844	165	14	number	number	NN
1844	165	15	of	of	IN
1844	165	16	fragments	fragment	NNS
1844	165	17	sent	send	VBN
1844	165	18	to	to	IN
1844	165	19	the	the	DT
1844	165	20	public	public	JJ
1844	165	21	infrastructure	infrastructure	NN
1844	165	22	will	will	MD
1844	165	23	never	never	RB
1844	165	24	be	be	VB
1844	165	25	greater	great	JJR
1844	165	26	than	than	IN
1844	165	27	or	or	CC
1844	165	28	equal	equal	JJ
1844	165	29	to	to	IN
1844	165	30	m	m	NNP
1844	165	31	,	,	,
1844	165	32	where	where	WRB
1844	165	33	m	m	NNP
1844	165	34	is	be	VBZ
1844	165	35	the	the	DT
1844	165	36	number	number	NN
1844	165	37	of	of	IN
1844	165	38	pieces	piece	NNS
1844	165	39	required	require	VBN
1844	165	40	to	to	TO
1844	165	41	build	build	VB
1844	165	42	the	the	DT
1844	165	43	original	original	JJ
1844	165	44	file	file	NN
1844	165	45	.	.	.
1844	166	1	Figure	figure	NN
1844	166	2	4	4	CD
1844	166	3	.	.	.
1844	167	1	Average	average	JJ
1844	167	2	Response	Response	NNP
1844	167	3	and	and	CC
1844	167	4	Service	Service	NNP
1844	167	5	Time	Time	NNP
1844	167	6	for	for	IN
1844	167	7	File	File	NNP
1844	167	8	Uploading	Uploading	NNP
1844	167	9	(	(	-LRB-
1844	167	10	FU	FU	NNP
1844	167	11	)	)	-RRB-
1844	167	12	and	and	CC
1844	167	13	Downloading	Downloading	NNP
1844	167	14	(	(	-LRB-
1844	167	15	FD	FD	NNP
1844	167	16	)	)	-RRB-
1844	167	17	in	in	IN
1844	167	18	the	the	DT
1844	167	19	Evaluation	Evaluation	NNP
1844	167	20	of	of	IN
1844	167	21	the	the	DT
1844	167	22	Hybrid	Hybrid	NNP
1844	167	23	Cloud	Cloud	NNP
1844	167	24	INFORMATION	INFORMATION	VBD
1844	167	25	TECHNOLOGY	technology	NN
1844	167	26	AND	and	CC
1844	167	27	LIBRARIES	LIBRARIES	NNP
1844	167	28	|	|	NNP
1844	167	29	DECEMBER	DECEMBER	NNP
1844	167	30	2012	2012	CD
1844	167	31	43	43	CD
1844	167	32	For	for	IN
1844	167	33	testing	test	VBG
1844	167	34	the	the	DT
1844	167	35	behavior	behavior	NN
1844	167	36	of	of	IN
1844	167	37	this	this	DT
1844	167	38	version	version	NN
1844	167	39	of	of	IN
1844	167	40	the	the	DT
1844	167	41	IDA	IDA	NNP
1844	167	42	,	,	,
1844	167	43	DAM	DAM	NNP
1844	167	44	always	always	RB
1844	167	45	had	have	VBD
1844	167	46	to	to	TO
1844	167	47	obtain	obtain	VB
1844	167	48	a	a	DT
1844	167	49	fragment	fragment	NN
1844	167	50	of	of	IN
1844	167	51	a	a	DT
1844	167	52	file	file	NN
1844	167	53	from	from	IN
1844	167	54	the	the	DT
1844	167	55	public	public	JJ
1844	167	56	cloud	cloud	NN
1844	167	57	(	(	-LRB-
1844	167	58	external	external	JJ
1844	167	59	providers	provider	NNS
1844	167	60	)	)	-RRB-
1844	167	61	.	.	.
1844	168	1	It	-PRON-	PRP
1844	168	2	should	should	MD
1844	168	3	be	be	VB
1844	168	4	noted	note	VBN
1844	168	5	that	that	IN
1844	168	6	this	this	DT
1844	168	7	is	be	VBZ
1844	168	8	not	not	RB
1844	168	9	the	the	DT
1844	168	10	typical	typical	JJ
1844	168	11	case	case	NN
1844	168	12	;	;	:
1844	168	13	in	in	IN
1844	168	14	a	a	DT
1844	168	15	real	real	JJ
1844	168	16	scenario	scenario	NN
1844	168	17	,	,	,
1844	168	18	the	the	DT
1844	168	19	hybrid	hybrid	JJ
1844	168	20	version	version	NN
1844	168	21	of	of	IN
1844	168	22	the	the	DT
1844	168	23	IDA	IDA	NNP
1844	168	24	only	only	RB
1844	168	25	would	would	MD
1844	168	26	obtain	obtain	VB
1844	168	27	a	a	DT
1844	168	28	fragment	fragment	NN
1844	168	29	of	of	IN
1844	168	30	a	a	DT
1844	168	31	file	file	NN
1844	168	32	from	from	IN
1844	168	33	the	the	DT
1844	168	34	public	public	JJ
1844	168	35	cloud	cloud	NN
1844	168	36	when	when	WRB
1844	168	37	the	the	DT
1844	168	38	DAM	DAM	NNP
1844	168	39	could	could	MD
1844	168	40	n’t	not	RB
1844	168	41	obtain	obtain	VB
1844	168	42	the	the	DT
1844	168	43	m	m	NN
1844	168	44	needed	need	VBN
1844	168	45	fragments	fragment	NNS
1844	168	46	from	from	IN
1844	168	47	the	the	DT
1844	168	48	private	private	JJ
1844	168	49	cloud	cloud	NN
1844	168	50	,	,	,
1844	168	51	which	which	WDT
1844	168	52	means	mean	VBZ
1844	168	53	that	that	IN
1844	168	54	more	more	JJR
1844	168	55	than	than	IN
1844	168	56	n	n	NNP
1844	168	57	-	-	HYPH
1844	168	58	m	m	NNP
1844	168	59	disks	disk	NNS
1844	168	60	had	have	VBD
1844	168	61	failed	fail	VBN
1844	168	62	(	(	-LRB-
1844	168	63	worst	bad	JJS
1844	168	64	case	case	NN
1844	168	65	)	)	-RRB-
1844	168	66	.	.	.
1844	169	1	The	the	DT
1844	169	2	two	two	CD
1844	169	3	public	public	JJ
1844	169	4	storage	storage	NN
1844	169	5	providers	provider	NNS
1844	169	6	showed	show	VBD
1844	169	7	similar	similar	JJ
1844	169	8	performance	performance	NN
1844	169	9	.	.	.
1844	170	1	However	however	RB
1844	170	2	,	,	,
1844	170	3	the	the	DT
1844	170	4	behavior	behavior	NN
1844	170	5	of	of	IN
1844	170	6	Dropbox	Dropbox	NNP
1844	170	7	was	be	VBD
1844	170	8	slightly	slightly	RB
1844	170	9	better	well	JJR
1844	170	10	than	than	IN
1844	170	11	TreeStore	TreeStore	NNP
1844	170	12	.	.	.
1844	171	1	This	this	DT
1844	171	2	could	could	MD
1844	171	3	be	be	VB
1844	171	4	because	because	IN
1844	171	5	of	of	IN
1844	171	6	the	the	DT
1844	171	7	maturity	maturity	NN
1844	171	8	of	of	IN
1844	171	9	the	the	DT
1844	171	10	Dropbox	Dropbox	NNP
1844	171	11	API	API	NNP
1844	171	12	or	or	CC
1844	171	13	because	because	IN
1844	171	14	of	of	IN
1844	171	15	a	a	DT
1844	171	16	better	well	JJR
1844	171	17	network	network	NN
1844	171	18	connection	connection	NN
1844	171	19	to	to	IN
1844	171	20	the	the	DT
1844	171	21	Dropbox	Dropbox	NNP
1844	171	22	sites	site	NNS
1844	171	23	.	.	.
1844	172	1	RELATED	related	JJ
1844	172	2	WORK	WORK	NNP
1844	172	3	Amazon	Amazon	NNP
1844	172	4	S3	S3	NNP
1844	172	5	is	be	VBZ
1844	172	6	considered	consider	VBN
1844	172	7	a	a	DT
1844	172	8	pioneer	pioneer	NN
1844	172	9	of	of	IN
1844	172	10	cloud	cloud	NN
1844	172	11	storage	storage	NN
1844	172	12	solutions	solution	NNS
1844	172	13	.	.	.
1844	173	1	Data	datum	NNS
1844	173	2	storage	storage	NN
1844	173	3	rates	rate	NNS
1844	173	4	vary	vary	VBP
1844	173	5	according	accord	VBG
1844	173	6	to	to	IN
1844	173	7	the	the	DT
1844	173	8	amount	amount	NN
1844	173	9	of	of	IN
1844	173	10	data	datum	NNS
1844	173	11	stored	store	VBN
1844	173	12	and	and	CC
1844	173	13	on	on	IN
1844	173	14	the	the	DT
1844	173	15	availability	availability	NN
1844	173	16	required	require	VBN
1844	173	17	by	by	IN
1844	173	18	users	user	NNS
1844	173	19	.	.	.
1844	174	1	Data	datum	NNS
1844	174	2	availability	availability	NN
1844	174	3	relates	relate	VBZ
1844	174	4	to	to	IN
1844	174	5	the	the	DT
1844	174	6	replication	replication	NN
1844	174	7	technique	technique	NN
1844	174	8	the	the	DT
1844	174	9	Amazon	Amazon	NNP
1844	174	10	infrastructure	infrastructure	NN
1844	174	11	uses.10	uses.10	NNP
1844	174	12	There	there	EX
1844	174	13	also	also	RB
1844	174	14	are	be	VBP
1844	174	15	solutions	solution	NNS
1844	174	16	that	that	WDT
1844	174	17	take	take	VBP
1844	174	18	advantage	advantage	NN
1844	174	19	of	of	IN
1844	174	20	public	public	JJ
1844	174	21	cloud	cloud	NN
1844	174	22	storage	storage	NN
1844	174	23	using	use	VBG
1844	174	24	replication	replication	NN
1844	174	25	techniques	technique	NNS
1844	174	26	based	base	VBN
1844	174	27	on	on	IN
1844	174	28	RAID	RAID	NNP
1844	174	29	,	,	,
1844	174	30	for	for	IN
1844	174	31	example	example	NN
1844	174	32	Redundant	Redundant	NNP
1844	174	33	Array	Array	NNP
1844	174	34	of	of	IN
1844	174	35	Cloud	Cloud	NNP
1844	174	36	Storage	Storage	NNP
1844	174	37	(	(	-LRB-
1844	174	38	RACS	RACS	NNP
1844	174	39	)	)	-RRB-
1844	174	40	,	,	,
1844	174	41	a	a	DT
1844	174	42	proxy	proxy	NN
1844	174	43	located	locate	VBN
1844	174	44	between	between	IN
1844	174	45	multiple	multiple	JJ
1844	174	46	cloud	cloud	NN
1844	174	47	storage	storage	NN
1844	174	48	providers	provider	NNS
1844	174	49	and	and	CC
1844	174	50	customers.11	customers.11	NNP
1844	174	51	RACS	RACS	NNP
1844	174	52	distributes	distribute	VBZ
1844	174	53	data	datum	NNS
1844	174	54	in	in	IN
1844	174	55	a	a	DT
1844	174	56	way	way	NN
1844	174	57	that	that	WDT
1844	174	58	provides	provide	VBZ
1844	174	59	an	an	DT
1844	174	60	opportunity	opportunity	NN
1844	174	61	for	for	IN
1844	174	62	clients	client	NNS
1844	174	63	to	to	TO
1844	174	64	tolerate	tolerate	VB
1844	174	65	interruptions	interruption	NNS
1844	174	66	in	in	IN
1844	174	67	a	a	DT
1844	174	68	public	public	JJ
1844	174	69	cloud	cloud	NN
1844	174	70	storage	storage	NN
1844	174	71	service	service	NN
1844	174	72	or	or	CC
1844	174	73	when	when	WRB
1844	174	74	the	the	DT
1844	174	75	price	price	NN
1844	174	76	for	for	IN
1844	174	77	using	use	VBG
1844	174	78	such	such	JJ
1844	174	79	services	service	NNS
1844	174	80	gets	get	VBZ
1844	174	81	too	too	RB
1844	174	82	high	high	JJ
1844	174	83	.	.	.
1844	175	1	It	-PRON-	PRP
1844	175	2	uses	use	VBZ
1844	175	3	replication	replication	NN
1844	175	4	to	to	TO
1844	175	5	support	support	VB
1844	175	6	such	such	JJ
1844	175	7	sit	sit	NN
1844	175	8	uations	uation	NNS
1844	175	9	.	.	.
1844	176	1	RACS	RACS	NNP
1844	176	2	offers	offer	VBZ
1844	176	3	to	to	IN
1844	176	4	its	-PRON-	PRP$
1844	176	5	users	user	NNS
1844	176	6	an	an	DT
1844	176	7	interface	interface	NN
1844	176	8	similar	similar	JJ
1844	176	9	to	to	IN
1844	176	10	Amazon	Amazon	NNP
1844	176	11	S3	S3	NNP
1844	176	12	,	,	,
1844	176	13	allowing	allow	VBG
1844	176	14	operations	operation	NNS
1844	176	15	such	such	JJ
1844	176	16	as	as	IN
1844	176	17	Put	Put	NNP
1844	176	18	,	,	,
1844	176	19	Get	get	VB
1844	176	20	,	,	,
1844	176	21	Delete	Delete	NNP
1844	176	22	,	,	,
1844	176	23	and	and	CC
1844	176	24	List	list	NN
1844	176	25	.	.	.
1844	177	1	Another	another	DT
1844	177	2	such	such	JJ
1844	177	3	service	service	NN
1844	177	4	is	be	VBZ
1844	177	5	High	high	JJ
1844	177	6	-	-	HYPH
1844	177	7	Availability	Availability	NNP
1844	177	8	and	and	CC
1844	177	9	Integrity	Integrity	NNP
1844	177	10	Layer	Layer	NNP
1844	177	11	(	(	-LRB-
1844	177	12	HAIL	HAIL	NNP
1844	177	13	)	)	-RRB-
1844	177	14	,	,	,
1844	177	15	a	a	DT
1844	177	16	cryptographic	cryptographic	JJ
1844	177	17	distributed	distribute	VBN
1844	177	18	system	system	NN
1844	177	19	that	that	WDT
1844	177	20	allows	allow	VBZ
1844	177	21	file	file	NN
1844	177	22	servers	server	NNS
1844	177	23	to	to	TO
1844	177	24	provide	provide	VB
1844	177	25	a	a	DT
1844	177	26	secure	secure	JJ
1844	177	27	storage	storage	NN
1844	177	28	environment.12	environment.12	NNP
1844	177	29	HAIL	HAIL	NNP
1844	177	30	supports	support	VBZ
1844	177	31	the	the	DT
1844	177	32	failure	failure	NN
1844	177	33	of	of	IN
1844	177	34	any	any	DT
1844	177	35	of	of	IN
1844	177	36	the	the	DT
1844	177	37	servers	server	NNS
1844	177	38	that	that	WDT
1844	177	39	make	make	VBP
1844	177	40	up	up	RP
1844	177	41	the	the	DT
1844	177	42	system	system	NN
1844	177	43	,	,	,
1844	177	44	adding	add	VBG
1844	177	45	a	a	DT
1844	177	46	degree	degree	NN
1844	177	47	of	of	IN
1844	177	48	security	security	NN
1844	177	49	to	to	IN
1844	177	50	stored	stored	JJ
1844	177	51	data	datum	NNS
1844	177	52	using	use	VBG
1844	177	53	an	an	DT
1844	177	54	approach	approach	NN
1844	177	55	based	base	VBN
1844	177	56	on	on	IN
1844	177	57	the	the	DT
1844	177	58	Reed	Reed	NNP
1844	177	59	Solomon	Solomon	NNP
1844	177	60	(	(	-LRB-
1844	177	61	RS	RS	NNP
1844	177	62	)	)	-RRB-
1844	177	63	error	error	NN
1844	177	64	correction	correction	NN
1844	177	65	codes.13	codes.13	NNP
1844	177	66	The	the	DT
1844	177	67	RS	RS	NNP
1844	177	68	codes	code	NNS
1844	177	69	describe	describe	VBP
1844	177	70	a	a	DT
1844	177	71	systematic	systematic	JJ
1844	177	72	way	way	NN
1844	177	73	of	of	IN
1844	177	74	building	building	NN
1844	177	75	codes	code	NNS
1844	177	76	that	that	WDT
1844	177	77	could	could	MD
1844	177	78	detect	detect	VB
1844	177	79	and	and	CC
1844	177	80	correct	correct	VB
1844	177	81	multiple	multiple	JJ
1844	177	82	random	random	JJ
1844	177	83	symbol	symbol	NN
1844	177	84	errors	error	NNS
1844	177	85	by	by	IN
1844	177	86	adding	add	VBG
1844	177	87	additional	additional	JJ
1844	177	88	check	check	NN
1844	177	89	symbols	symbol	NNS
1844	177	90	to	to	IN
1844	177	91	the	the	DT
1844	177	92	data	datum	NNS
1844	177	93	.	.	.
1844	178	1	Public	public	JJ
1844	178	2	cloud	cloud	NN
1844	178	3	-	-	HYPH
1844	178	4	storage	storage	NN
1844	178	5	infrastructures	infrastructure	NNS
1844	178	6	such	such	JJ
1844	178	7	as	as	IN
1844	178	8	Amazon	Amazon	NNP
1844	178	9	3	3	CD
1844	178	10	,	,	,
1844	178	11	Rackspace	Rackspace	NNP
1844	178	12	,	,	,
1844	178	13	and	and	CC
1844	178	14	Google	Google	NNP
1844	178	15	Storage	Storage	NNP
1844	178	16	are	be	VBP
1844	178	17	being	be	VBG
1844	178	18	used	use	VBN
1844	178	19	by	by	IN
1844	178	20	distributed	distribute	VBN
1844	178	21	file	file	NN
1844	178	22	systems	system	NNS
1844	178	23	such	such	JJ
1844	178	24	as	as	IN
1844	178	25	Dropbox	Dropbox	NNP
1844	178	26	(	(	-LRB-
1844	178	27	http://www.dropbox.com	http://www.dropbox.com	ADD
1844	178	28	)	)	-RRB-
1844	178	29	,	,	,
1844	178	30	Wuala	Wuala	NNP
1844	178	31	(	(	-LRB-
1844	178	32	http://www.wuala.com	http://www.wuala.com	ADD
1844	178	33	)	)	-RRB-
1844	178	34	,	,	,
1844	178	35	and	and	CC
1844	178	36	ADrive	ADrive	NNP
1844	178	37	(	(	-LRB-
1844	178	38	http://www.adrive.com	http://www.adrive.com	ADD
1844	178	39	)	)	-RRB-
1844	178	40	,	,	,
1844	178	41	which	which	WDT
1844	178	42	allow	allow	VBP
1844	178	43	users	user	NNS
1844	178	44	to	to	TO
1844	178	45	store	store	VB
1844	178	46	and	and	CC
1844	178	47	share	share	VB
1844	178	48	files	file	NNS
1844	178	49	through	through	IN
1844	178	50	web	web	NN
1844	178	51	applications.14	applications.14	NNP
1844	178	52	A	a	DT
1844	178	53	commonality	commonality	NN
1844	178	54	between	between	IN
1844	178	55	these	these	DT
1844	178	56	infrastructures	infrastructure	NNS
1844	178	57	and	and	CC
1844	178	58	applications	application	NNS
1844	178	59	is	be	VBZ
1844	178	60	their	-PRON-	PRP$
1844	178	61	use	use	NN
1844	178	62	of	of	IN
1844	178	63	public	public	JJ
1844	178	64	clouds	cloud	NNS
1844	178	65	.	.	.
1844	179	1	These	these	DT
1844	179	2	services	service	NNS
1844	179	3	are	be	VBP
1844	179	4	helpful	helpful	JJ
1844	179	5	for	for	IN
1844	179	6	users	user	NNS
1844	179	7	wanting	want	VBG
1844	179	8	to	to	TO
1844	179	9	have	have	VB
1844	179	10	unlimited	unlimited	JJ
1844	179	11	storage	storage	NN
1844	179	12	space	space	NN
1844	179	13	with	with	IN
1844	179	14	which	which	WDT
1844	179	15	to	to	TO
1844	179	16	back	back	VB
1844	179	17	up	up	RP
1844	179	18	their	-PRON-	PRP$
1844	179	19	data	datum	NNS
1844	179	20	.	.	.
1844	180	1	However	however	RB
1844	180	2	,	,	,
1844	180	3	the	the	DT
1844	180	4	use	use	NN
1844	180	5	of	of	IN
1844	180	6	these	these	DT
1844	180	7	types	type	NNS
1844	180	8	of	of	IN
1844	180	9	solutions	solution	NNS
1844	180	10	can	can	MD
1844	180	11	be	be	VB
1844	180	12	challenging	challenge	VBG
1844	180	13	in	in	IN
1844	180	14	a	a	DT
1844	180	15	business	business	NN
1844	180	16	environment	environment	NN
1844	180	17	.	.	.
1844	181	1	The	the	DT
1844	181	2	fears	fear	NNS
1844	181	3	that	that	IN
1844	181	4	some	some	DT
1844	181	5	organizations	organization	NNS
1844	181	6	have	have	VBP
1844	181	7	about	about	IN
1844	181	8	storing	store	VBG
1844	181	9	sensitive	sensitive	JJ
1844	181	10	data	datum	NNS
1844	181	11	in	in	IN
1844	181	12	a	a	DT
1844	181	13	public	public	JJ
1844	181	14	infrastructure	infrastructure	NN
1844	181	15	or	or	CC
1844	181	16	about	about	IN
1844	181	17	future	future	JJ
1844	181	18	data	datum	NNS
1844	181	19	availability	availability	NN
1844	181	20	are	be	VBP
1844	181	21	issues	issue	NNS
1844	181	22	that	that	WDT
1844	181	23	discourage	discourage	VBP
1844	181	24	the	the	DT
1844	181	25	use	use	NN
1844	181	26	of	of	IN
1844	181	27	such	such	JJ
1844	181	28	third	third	JJ
1844	181	29	-	-	HYPH
1844	181	30	party	party	NN
1844	181	31	infrastructure	infrastructure	NN
1844	181	32	.	.	.
1844	182	1	Our	-PRON-	PRP$
1844	182	2	approach	approach	NN
1844	182	3	suggests	suggest	VBZ
1844	182	4	a	a	DT
1844	182	5	viable	viable	JJ
1844	182	6	option	option	NN
1844	182	7	is	be	VBZ
1844	182	8	creating	create	VBG
1844	182	9	a	a	DT
1844	182	10	hybrid	hybrid	JJ
1844	182	11	cloud	cloud	NN
1844	182	12	storage	storage	NN
1844	182	13	environment	environment	NN
1844	182	14	(	(	-LRB-
1844	182	15	private	private	JJ
1844	182	16	+	+	SYM
1844	182	17	public	public	JJ
1844	182	18	)	)	-RRB-
1844	182	19	based	base	VBN
1844	182	20	on	on	IN
1844	182	21	low	low	JJ
1844	182	22	cost	cost	NN
1844	182	23	infrastructure	infrastructure	NN
1844	182	24	in	in	IN
1844	182	25	which	which	WDT
1844	182	26	only	only	JJ
1844	182	27	part	part	NN
1844	182	28	of	of	IN
1844	182	29	the	the	DT
1844	182	30	stored	stored	JJ
1844	182	31	data	datum	NNS
1844	182	32	are	be	VBP
1844	182	33	in	in	IN
1844	182	34	the	the	DT
1844	182	35	public	public	JJ
1844	182	36	environment	environment	NN
1844	182	37	,	,	,
1844	182	38	thereby	thereby	RB
1844	182	39	minimizing	minimize	VBG
1844	182	40	the	the	DT
1844	182	41	likelihood	likelihood	NN
1844	182	42	of	of	IN
1844	182	43	unauthorized	unauthorized	JJ
1844	182	44	access	access	NN
1844	182	45	.	.	.
1844	183	1	http://www.dropbox.com/	http://www.dropbox.com/	NNP
1844	183	2	http://www.wuala.com/	http://www.wuala.com/	NNP
1844	183	3	http://www.adrive.com/	http://www.adrive.com/	NNP
1844	183	4	A	a	DT
1844	183	5	FILE	FILE	NNP
1844	183	6	STORAGE	STORAGE	NNP
1844	183	7	SERVICE	service	NN
1844	183	8	ON	on	IN
1844	183	9	A	a	DT
1844	183	10	CLOUD	cloud	JJ
1844	183	11	COMPUTING	computing	NN
1844	183	12	ENVIRONMENT	environment	NN
1844	183	13	FOR	for	IN
1844	183	14	DIGITAL	DIGITAL	NNP
1844	183	15	LIBRARIES	library	NNS
1844	183	16	|	|	NNP
1844	183	17	SOSA	SOSA	NNP
1844	183	18	-	-	HYPH
1844	183	19	SOSA	SOSA	NNP
1844	183	20	44	44	CD
1844	183	21	CONCLUSIONS	conclusion	NNS
1844	183	22	Digital	Digital	NNP
1844	183	23	-	-	HYPH
1844	183	24	data	data	NN
1844	183	25	preservation	preservation	NN
1844	183	26	represents	represent	VBZ
1844	183	27	a	a	DT
1844	183	28	threat	threat	NN
1844	183	29	to	to	IN
1844	183	30	digital	digital	JJ
1844	183	31	libraries	library	NNS
1844	183	32	.	.	.
1844	184	1	Data	datum	NNS
1844	184	2	are	be	VBP
1844	184	3	an	an	DT
1844	184	4	essential	essential	JJ
1844	184	5	part	part	NN
1844	184	6	of	of	IN
1844	184	7	a	a	DT
1844	184	8	library	library	NN
1844	184	9	,	,	,
1844	184	10	and	and	CC
1844	184	11	its	-PRON-	PRP$
1844	184	12	storage	storage	NN
1844	184	13	is	be	VBZ
1844	184	14	of	of	IN
1844	184	15	the	the	DT
1844	184	16	utmost	utmost	JJ
1844	184	17	importance	importance	NN
1844	184	18	.	.	.
1844	185	1	Digital	digital	JJ
1844	185	2	-	-	HYPH
1844	185	3	data	data	NN
1844	185	4	storage	storage	NN
1844	185	5	requires	require	VBZ
1844	185	6	extreme	extreme	JJ
1844	185	7	durability	durability	NN
1844	185	8	and	and	CC
1844	185	9	scalability	scalability	NN
1844	185	10	.	.	.
1844	186	1	However	however	RB
1844	186	2	,	,	,
1844	186	3	component	component	NN
1844	186	4	failures	failure	NNS
1844	186	5	,	,	,
1844	186	6	obsolescence	obsolescence	NN
1844	186	7	,	,	,
1844	186	8	human	human	JJ
1844	186	9	-	-	HYPH
1844	186	10	operation	operation	NN
1844	186	11	errors	error	NNS
1844	186	12	,	,	,
1844	186	13	natural	natural	JJ
1844	186	14	disasters	disaster	NNS
1844	186	15	,	,	,
1844	186	16	attacks	attack	NNS
1844	186	17	,	,	,
1844	186	18	or	or	CC
1844	186	19	management	management	NN
1844	186	20	errors	error	NNS
1844	186	21	are	be	VBP
1844	186	22	some	some	DT
1844	186	23	common	common	JJ
1844	186	24	difficulties	difficulty	NNS
1844	186	25	that	that	WDT
1844	186	26	must	must	MD
1844	186	27	be	be	VB
1844	186	28	carefully	carefully	RB
1844	186	29	studied	study	VBN
1844	186	30	when	when	WRB
1844	186	31	implementing	implement	VBG
1844	186	32	a	a	DT
1844	186	33	digital	digital	JJ
1844	186	34	library	library	NN
1844	186	35	.	.	.
1844	187	1	These	these	DT
1844	187	2	threats	threat	NNS
1844	187	3	may	may	MD
1844	187	4	be	be	VB
1844	187	5	minimized	minimize	VBN
1844	187	6	using	use	VBG
1844	187	7	a	a	DT
1844	187	8	distributed	distribute	VBN
1844	187	9	data	data	NN
1844	187	10	-	-	HYPH
1844	187	11	storage	storage	NN
1844	187	12	approach	approach	NN
1844	187	13	.	.	.
1844	188	1	In	in	IN
1844	188	2	this	this	DT
1844	188	3	area	area	NN
1844	188	4	,	,	,
1844	188	5	cloud	cloud	NN
1844	188	6	computing	computing	NN
1844	188	7	may	may	MD
1844	188	8	help	help	VB
1844	188	9	,	,	,
1844	188	10	as	as	IN
1844	188	11	both	both	CC
1844	188	12	the	the	DT
1844	188	13	storage	storage	NN
1844	188	14	and	and	CC
1844	188	15	the	the	DT
1844	188	16	services	service	NNS
1844	188	17	are	be	VBP
1844	188	18	completely	completely	RB
1844	188	19	distributed	distribute	VBN
1844	188	20	.	.	.
1844	189	1	This	this	DT
1844	189	2	paper	paper	NN
1844	189	3	presented	present	VBD
1844	189	4	a	a	DT
1844	189	5	comparison	comparison	NN
1844	189	6	of	of	IN
1844	189	7	different	different	JJ
1844	189	8	replication	replication	NN
1844	189	9	techniques	technique	NNS
1844	189	10	implemented	implement	VBN
1844	189	11	in	in	IN
1844	189	12	a	a	DT
1844	189	13	private	private	JJ
1844	189	14	and	and	CC
1844	189	15	hybrid	hybrid	JJ
1844	189	16	cloud	cloud	NN
1844	189	17	-	-	HYPH
1844	189	18	storage	storage	NN
1844	189	19	infrastructure	infrastructure	NN
1844	189	20	.	.	.
1844	190	1	We	-PRON-	PRP
1844	190	2	described	describe	VBD
1844	190	3	the	the	DT
1844	190	4	components	component	NNS
1844	190	5	of	of	IN
1844	190	6	this	this	DT
1844	190	7	infrastructure	infrastructure	NN
1844	190	8	and	and	CC
1844	190	9	demonstrated	demonstrate	VBD
1844	190	10	that	that	IN
1844	190	11	it	-PRON-	PRP
1844	190	12	is	be	VBZ
1844	190	13	possible	possible	JJ
1844	190	14	to	to	TO
1844	190	15	improve	improve	VB
1844	190	16	the	the	DT
1844	190	17	time	time	NN
1844	190	18	of	of	IN
1844	190	19	system	system	NN
1844	190	20	deployment	deployment	NN
1844	190	21	and	and	CC
1844	190	22	performance	performance	NN
1844	190	23	when	when	WRB
1844	190	24	elastic	elastic	JJ
1844	190	25	services	service	NNS
1844	190	26	(	(	-LRB-
1844	190	27	virtualized	virtualized	JJ
1844	190	28	)	)	-RRB-
1844	190	29	are	be	VBP
1844	190	30	implemented	implement	VBN
1844	190	31	on	on	IN
1844	190	32	physical	physical	JJ
1844	190	33	machines	machine	NNS
1844	190	34	.	.	.
1844	191	1	We	-PRON-	PRP
1844	191	2	illustrated	illustrate	VBD
1844	191	3	how	how	WRB
1844	191	4	to	to	TO
1844	191	5	optimize	optimize	VB
1844	191	6	the	the	DT
1844	191	7	use	use	NN
1844	191	8	of	of	IN
1844	191	9	physical	physical	JJ
1844	191	10	machine	machine	NN
1844	191	11	resources	resource	NNS
1844	191	12	,	,	,
1844	191	13	especially	especially	RB
1844	191	14	when	when	WRB
1844	191	15	running	run	VBG
1844	191	16	systems	system	NNS
1844	191	17	(	(	-LRB-
1844	191	18	like	like	IN
1844	191	19	the	the	DT
1844	191	20	storage	storage	NN
1844	191	21	service	service	NN
1844	191	22	)	)	-RRB-
1844	191	23	with	with	IN
1844	191	24	an	an	DT
1844	191	25	unpredictable	unpredictable	JJ
1844	191	26	workload	workload	NN
1844	191	27	.	.	.
1844	192	1	The	the	DT
1844	192	2	replication	replication	NN
1844	192	3	techniques	technique	NNS
1844	192	4	evaluated	evaluate	VBN
1844	192	5	in	in	IN
1844	192	6	this	this	DT
1844	192	7	paper	paper	NN
1844	192	8	were	be	VBD
1844	192	9	implemented	implement	VBN
1844	192	10	in	in	IN
1844	192	11	a	a	DT
1844	192	12	data	data	NN
1844	192	13	access	access	NN
1844	192	14	module	module	NN
1844	192	15	called	call	VBN
1844	192	16	DAM	DAM	NNP
1844	192	17	.	.	.
1844	193	1	DAM	dam	NN
1844	193	2	is	be	VBZ
1844	193	3	a	a	DT
1844	193	4	simple	simple	JJ
1844	193	5	mechanism	mechanism	NN
1844	193	6	for	for	IN
1844	193	7	storage	storage	NN
1844	193	8	consolidation	consolidation	NN
1844	193	9	on	on	IN
1844	193	10	a	a	DT
1844	193	11	private	private	JJ
1844	193	12	and	and	CC
1844	193	13	hybrid	hybrid	JJ
1844	193	14	cloud	cloud	NN
1844	193	15	environment	environment	NN
1844	193	16	,	,	,
1844	193	17	and	and	CC
1844	193	18	it	-PRON-	PRP
1844	193	19	is	be	VBZ
1844	193	20	able	able	JJ
1844	193	21	to	to	TO
1844	193	22	offer	offer	VB
1844	193	23	different	different	JJ
1844	193	24	levels	level	NNS
1844	193	25	of	of	IN
1844	193	26	data	datum	NNS
1844	193	27	availability	availability	NN
1844	193	28	based	base	VBN
1844	193	29	on	on	IN
1844	193	30	user	user	NN
1844	193	31	requirements	requirement	NNS
1844	193	32	.	.	.
1844	194	1	It	-PRON-	PRP
1844	194	2	uses	use	VBZ
1844	194	3	a	a	DT
1844	194	4	lightweight	lightweight	JJ
1844	194	5	algorithm	algorithm	NN
1844	194	6	for	for	IN
1844	194	7	file	file	NN
1844	194	8	allocation	allocation	NN
1844	194	9	,	,	,
1844	194	10	reducing	reduce	VBG
1844	194	11	the	the	DT
1844	194	12	amount	amount	NN
1844	194	13	of	of	IN
1844	194	14	metadata	metadata	NN
1844	194	15	needed	need	VBN
1844	194	16	with	with	IN
1844	194	17	low	low	JJ
1844	194	18	resources	resource	NNS
1844	194	19	consumption	consumption	NN
1844	194	20	.	.	.
1844	195	1	We	-PRON-	PRP
1844	195	2	showed	show	VBD
1844	195	3	how	how	WRB
1844	195	4	a	a	DT
1844	195	5	hybrid	hybrid	JJ
1844	195	6	cloud	cloud	NN
1844	195	7	environment	environment	NN
1844	195	8	,	,	,
1844	195	9	implemented	implement	VBN
1844	195	10	with	with	IN
1844	195	11	freely	freely	RB
1844	195	12	available	available	JJ
1844	195	13	software	software	NN
1844	195	14	tools	tool	NNS
1844	195	15	,	,	,
1844	195	16	can	can	MD
1844	195	17	be	be	VB
1844	195	18	a	a	DT
1844	195	19	good	good	JJ
1844	195	20	solution	solution	NN
1844	195	21	for	for	IN
1844	195	22	those	those	DT
1844	195	23	institutions	institution	NNS
1844	195	24	not	not	RB
1844	195	25	confident	confident	JJ
1844	195	26	storing	store	VBG
1844	195	27	sensitive	sensitive	JJ
1844	195	28	data	datum	NNS
1844	195	29	in	in	IN
1844	195	30	public	public	JJ
1844	195	31	storage	storage	NN
1844	195	32	clouds	cloud	NNS
1844	195	33	and	and	CC
1844	195	34	those	those	DT
1844	195	35	institutions	institution	NNS
1844	195	36	having	have	VBG
1844	195	37	economic	economic	JJ
1844	195	38	and	and	CC
1844	195	39	technical	technical	JJ
1844	195	40	limitations	limitation	NNS
1844	195	41	for	for	IN
1844	195	42	building	build	VBG
1844	195	43	their	-PRON-	PRP$
1844	195	44	own	own	JJ
1844	195	45	private	private	JJ
1844	195	46	cloud	cloud	NN
1844	195	47	.	.	.
1844	196	1	The	the	DT
1844	196	2	prototype	prototype	NN
1844	196	3	described	describe	VBN
1844	196	4	in	in	IN
1844	196	5	this	this	DT
1844	196	6	paper	paper	NN
1844	196	7	showed	show	VBD
1844	196	8	how	how	WRB
1844	196	9	feasible	feasible	JJ
1844	196	10	it	-PRON-	PRP
1844	196	11	is	be	VBZ
1844	196	12	to	to	TO
1844	196	13	build	build	VB
1844	196	14	a	a	DT
1844	196	15	modest	modest	JJ
1844	196	16	private	private	JJ
1844	196	17	cloud	cloud	NN
1844	196	18	and	and	CC
1844	196	19	combine	combine	VB
1844	196	20	it	-PRON-	PRP
1844	196	21	with	with	IN
1844	196	22	a	a	DT
1844	196	23	consolidated	consolidated	JJ
1844	196	24	public	public	JJ
1844	196	25	cloud	cloud	NN
1844	196	26	.	.	.
1844	197	1	In	in	IN
1844	197	2	this	this	DT
1844	197	3	context	context	NN
1844	197	4	,	,	,
1844	197	5	this	this	DT
1844	197	6	paper	paper	NN
1844	197	7	showed	show	VBD
1844	197	8	how	how	WRB
1844	197	9	the	the	DT
1844	197	10	use	use	NN
1844	197	11	of	of	IN
1844	197	12	a	a	DT
1844	197	13	replication	replication	NN
1844	197	14	technique	technique	NN
1844	197	15	based	base	VBN
1844	197	16	on	on	IN
1844	197	17	an	an	DT
1844	197	18	IDA	IDA	NNP
1844	197	19	has	have	VBZ
1844	197	20	the	the	DT
1844	197	21	benefits	benefit	NNS
1844	197	22	of	of	IN
1844	197	23	the	the	DT
1844	197	24	public	public	JJ
1844	197	25	cloud	cloud	NN
1844	197	26	storage	storage	NN
1844	197	27	without	without	IN
1844	197	28	exposing	expose	VBG
1844	197	29	the	the	DT
1844	197	30	complete	complete	JJ
1844	197	31	content	content	NN
1844	197	32	of	of	IN
1844	197	33	files	file	NNS
1844	197	34	via	via	IN
1844	197	35	a	a	DT
1844	197	36	third-	third-	JJ
1844	197	37	party	party	NN
1844	197	38	infrastructure	infrastructure	NN
1844	197	39	.	.	.
1844	198	1	REFERENCES	reference	NNS
1844	198	2	1	1	CD
1844	198	3	.	.	.
1844	199	1	John	John	NNP
1844	199	2	F.	F.	NNP
1844	199	3	Gantz	Gantz	NNP
1844	199	4	et	et	FW
1844	199	5	al	al	NNP
1844	199	6	.	.	NNP
1844	199	7	,	,	,
1844	199	8	“	"	``
1844	199	9	The	the	DT
1844	199	10	Expanding	Expanding	NNP
1844	199	11	Digital	Digital	NNP
1844	199	12	Universe	universe	NN
1844	199	13	:	:	.
1844	199	14	A	a	DT
1844	199	15	Forecast	Forecast	NNP
1844	199	16	of	of	IN
1844	199	17	Worldwide	Worldwide	NNP
1844	199	18	Information	Information	NNP
1844	199	19	Growth	Growth	NNP
1844	199	20	Through	through	IN
1844	199	21	2010	2010	CD
1844	199	22	,	,	,
1844	199	23	”	"	''
1844	199	24	An	an	DT
1844	199	25	IDC	IDC	NNP
1844	199	26	White	White	NNP
1844	199	27	Paper	Paper	NNP
1844	199	28	—	—	:
1844	199	29	sponsored	sponsor	VBN
1844	199	30	by	by	IN
1844	199	31	EMC	EMC	NNP
1844	199	32	,	,	,
1844	199	33	March	March	NNP
1844	199	34	2007	2007	CD
1844	199	35	,	,	,
1844	199	36	http://www.emc.com/collateral/analyst-reports/expanding-digital-idc-white-paper.pdf	http://www.emc.com/collateral/analyst-reports/expanding-digital-idc-white-paper.pdf	NNP
1844	199	37	(	(	-LRB-
1844	199	38	accessed	access	VBN
1844	199	39	September	September	NNP
1844	199	40	12	12	CD
1844	199	41	,	,	,
1844	199	42	2012	2012	CD
1844	199	43	)	)	-RRB-
1844	199	44	.	.	.
1844	200	1	2	2	LS
1844	200	2	.	.	.
1844	201	1	Jay	Jay	NNP
1844	201	2	Jordan	Jordan	NNP
1844	201	3	,	,	,
1844	201	4	“	"	``
1844	201	5	Climbing	climb	VBG
1844	201	6	Out	out	IN
1844	201	7	of	of	IN
1844	201	8	the	the	DT
1844	201	9	Box	Box	NNP
1844	201	10	and	and	CC
1844	201	11	Into	into	IN
1844	201	12	the	the	DT
1844	201	13	Cloud	Cloud	NNP
1844	201	14	:	:	:
1844	201	15	Building	Building	NNP
1844	201	16	Web	web	NN
1844	201	17	-	-	HYPH
1844	201	18	Scale	Scale	NNP
1844	201	19	for	for	IN
1844	201	20	Libraries	library	NNS
1844	201	21	,	,	,
1844	201	22	”	"	''
1844	201	23	Journal	Journal	NNP
1844	201	24	of	of	IN
1844	201	25	Library	Library	NNP
1844	201	26	Administration	Administration	NNP
1844	201	27	51	51	CD
1844	201	28	,	,	,
1844	201	29	no	no	UH
1844	201	30	.	.	.
1844	202	1	1	1	CD
1844	202	2	(	(	-LRB-
1844	202	3	2011	2011	CD
1844	202	4	)	)	-RRB-
1844	202	5	:	:	:
1844	202	6	3–17	3–17	NNP
1844	202	7	,	,	,
1844	202	8	doi	doi	XX
1844	202	9	:	:	:
1844	202	10	10.1080/01930826.2011.531637	10.1080/01930826.2011.531637	CD
1844	202	11	.	.	.
1844	203	1	3	3	LS
1844	203	2	.	.	.
1844	204	1	Przemysław	Przemysław	NNP
1844	204	2	Skibiński	Skibiński	NNP
1844	204	3	and	and	CC
1844	204	4	Jakub	Jakub	NNP
1844	204	5	Swacha	Swacha	NNP
1844	204	6	,	,	,
1844	204	7	“	"	``
1844	204	8	The	the	DT
1844	204	9	Efficient	efficient	JJ
1844	204	10	Storage	storage	NN
1844	204	11	of	of	IN
1844	204	12	Text	Text	NNP
1844	204	13	Documents	document	NNS
1844	204	14	in	in	IN
1844	204	15	Digital	Digital	NNP
1844	204	16	Libraries	Libraries	NNPS
1844	204	17	,	,	,
1844	204	18	”	"	''
1844	204	19	Information	Information	NNP
1844	204	20	Technology	Technology	NNP
1844	204	21	&	&	CC
1844	204	22	Libraries	Libraries	NNP
1844	204	23	28	28	CD
1844	204	24	,	,	,
1844	204	25	no	no	UH
1844	204	26	.	.	.
1844	205	1	3	3	CD
1844	205	2	(	(	-LRB-
1844	205	3	2009	2009	CD
1844	205	4	)	)	-RRB-
1844	205	5	:	:	:
1844	205	6	143–53	143–53	CD
1844	205	7	.	.	.
1844	206	1	4	4	LS
1844	206	2	.	.	.
1844	207	1	Yan	Yan	NNP
1844	207	2	Han	Han	NNP
1844	207	3	,	,	,
1844	207	4	“	"	``
1844	207	5	On	on	IN
1844	207	6	the	the	DT
1844	207	7	Clouds	Clouds	NNPS
1844	207	8	:	:	:
1844	207	9	A	a	DT
1844	207	10	New	New	NNP
1844	207	11	Way	Way	NNP
1844	207	12	of	of	IN
1844	207	13	Computing	computing	NN
1844	207	14	,	,	,
1844	207	15	”	"	''
1844	207	16	Information	Information	NNP
1844	207	17	Technology	Technology	NNP
1844	207	18	&	&	CC
1844	207	19	Libraries	Libraries	NNP
1844	207	20	29	29	CD
1844	207	21	,	,	,
1844	207	22	no	no	UH
1844	207	23	.	.	.
1844	208	1	2	2	CD
1844	208	2	(	(	-LRB-
1844	208	3	2010	2010	CD
1844	208	4	)	)	-RRB-
1844	208	5	:	:	:
1844	208	6	87–92	87–92	LS
1844	208	7	;	;	:
1844	208	8	Tom	Tom	NNP
1844	208	9	Ipri	Ipri	NNP
1844	208	10	,	,	,
1844	208	11	“	"	``
1844	208	12	Where	where	WRB
1844	208	13	the	the	DT
1844	208	14	Cloud	Cloud	NNP
1844	208	15	Meets	meet	VBZ
1844	208	16	the	the	DT
1844	208	17	Commons	Commons	NNPS
1844	208	18	,	,	,
1844	208	19	”	"	''
1844	208	20	Journal	Journal	NNP
1844	208	21	of	of	IN
1844	208	22	Web	Web	NNP
1844	208	23	Librarianship	Librarianship	NNP
1844	208	24	5	5	CD
1844	208	25	,	,	,
1844	208	26	no	no	UH
1844	208	27	.	.	.
1844	209	1	2	2	CD
1844	209	2	(	(	-LRB-
1844	209	3	2011	2011	CD
1844	209	4	)	)	-RRB-
1844	209	5	:	:	:
1844	209	6	132–41	132–41	CD
1844	209	7	,	,	,
1844	209	8	doi	doi	XX
1844	209	9	:	:	:
1844	209	10	10.1080/19322909.2011.573295	10.1080/19322909.2011.573295	NN
1844	209	11	.	.	.
1844	210	1	http://www.emc.com/collateral/analyst-reports/expanding-digital-idc-white-paper.pdf	http://www.emc.com/collateral/analyst-reports/expanding-digital-idc-white-paper.pdf	LS
1844	210	2	INFORMATION	INFORMATION	NNP
1844	210	3	TECHNOLOGY	TECHNOLOGY	NNP
1844	210	4	AND	and	CC
1844	210	5	LIBRARIES	LIBRARIES	NNP
1844	210	6	|	|	NNP
1844	210	7	DECEMBER	DECEMBER	NNP
1844	210	8	2012	2012	CD
1844	210	9	45	45	CD
1844	210	10	5	5	CD
1844	210	11	.	.	.
1844	211	1	Kernel	Kernel	NNP
1844	211	2	Based	base	VBN
1844	211	3	Virtual	virtual	JJ
1844	211	4	Machine	Machine	NNP
1844	211	5	homepage	homepage	NN
1844	211	6	,	,	,
1844	211	7	http://www.linux-kvm.org	http://www.linux-kvm.org	NNP
1844	211	8	(	(	-LRB-
1844	211	9	accessed	access	VBN
1844	211	10	September	September	NNP
1844	211	11	12	12	CD
1844	211	12	,	,	,
1844	211	13	2012	2012	CD
1844	211	14	)	)	-RRB-
1844	211	15	;	;	:
1844	211	16	Paul	Paul	NNP
1844	211	17	Barham	Barham	NNP
1844	211	18	et	et	FW
1844	211	19	al	al	NNP
1844	211	20	.	.	NNP
1844	211	21	,	,	,
1844	211	22	“	"	``
1844	211	23	Xen	Xen	NNP
1844	211	24	and	and	CC
1844	211	25	the	the	DT
1844	211	26	Art	Art	NNP
1844	211	27	of	of	IN
1844	211	28	Virtualization	Virtualization	NNP
1844	211	29	,	,	,
1844	211	30	”	"	''
1844	211	31	in	in	IN
1844	211	32	Proceedings	Proceedings	NNP
1844	211	33	of	of	IN
1844	211	34	the	the	DT
1844	211	35	19th	19th	JJ
1844	211	36	ACM	ACM	NNP
1844	211	37	Symposium	Symposium	NNP
1844	211	38	on	on	IN
1844	211	39	Operating	Operating	NNP
1844	211	40	Systems	Systems	NNPS
1844	211	41	Principles(New	Principles(New	NNP
1844	211	42	York	york	NN
1844	211	43	:	:	:
1844	211	44	ACM	ACM	NNP
1844	211	45	,	,	,
1844	211	46	2003	2003	CD
1844	211	47	)	)	-RRB-
1844	211	48	,	,	,
1844	211	49	doi	doi	XX
1844	211	50	:	:	:
1844	211	51	10.1145/1165389.945462	10.1145/1165389.945462	NNS
1844	211	52	.	.	.
1844	212	1	6	6	CD
1844	212	2	.	.	.
1844	213	1	“	"	``
1844	213	2	XenVsKVM	XenVsKVM	NNP
1844	213	3	,	,	,
1844	213	4	”	"	''
1844	213	5	Linux	Linux	NNP
1844	213	6	Virtualization	Virtualization	NNP
1844	213	7	Wiki	Wiki	NNP
1844	213	8	,	,	,
1844	213	9	last	last	RB
1844	213	10	updated	update	VBN
1844	213	11	August	August	NNP
1844	213	12	16	16	CD
1844	213	13	,	,	,
1844	213	14	2008	2008	CD
1844	213	15	,	,	,
1844	213	16	http://virt.kernelnewbies.org/XenVsKVM	http://virt.kernelnewbies.org/XenVsKVM	,
1844	213	17	(	(	-LRB-
1844	213	18	accessed	access	VBN
1844	213	19	September	September	NNP
1844	213	20	12	12	CD
1844	213	21	,	,	,
1844	213	22	2012	2012	CD
1844	213	23	)	)	-RRB-
1844	213	24	.	.	.
1844	214	1	7	7	LS
1844	214	2	.	.	.
1844	215	1	Michael	Michael	NNP
1844	215	2	O.	O.	NNP
1844	215	3	Rabin	Rabin	NNP
1844	215	4	,	,	,
1844	215	5	“	"	``
1844	215	6	Efficient	Efficient	NNP
1844	215	7	Dispersal	Dispersal	NNP
1844	215	8	of	of	IN
1844	215	9	Information	Information	NNP
1844	215	10	for	for	IN
1844	215	11	Security	Security	NNP
1844	215	12	,	,	,
1844	215	13	Load	Load	NNP
1844	215	14	Balancing	Balancing	NNP
1844	215	15	,	,	,
1844	215	16	and	and	CC
1844	215	17	Fault	Fault	NNP
1844	215	18	Tolerance	Tolerance	NNP
1844	215	19	,	,	,
1844	215	20	”	"	''
1844	215	21	Journal	Journal	NNP
1844	215	22	of	of	IN
1844	215	23	the	the	DT
1844	215	24	ACM	ACM	NNP
1844	215	25	36	36	CD
1844	215	26	,	,	,
1844	215	27	no	no	UH
1844	215	28	.	.	.
1844	216	1	2	2	LS
1844	216	2	(	(	-LRB-
1844	216	3	April	April	NNP
1844	216	4	1989	1989	CD
1844	216	5	)	)	-RRB-
1844	216	6	:	:	:
1844	216	7	335–48	335–48	CD
1844	216	8	,	,	,
1844	216	9	doi	doi	XX
1844	216	10	:	:	:
1844	216	11	10.1145/62044.62050	10.1145/62044.62050	CD
1844	216	12	.	.	.
1844	217	1	8	8	LS
1844	217	2	.	.	.
1844	218	1	David	David	NNP
1844	218	2	A.	A.	NNP
1844	218	3	Patterson	Patterson	NNP
1844	218	4	,	,	,
1844	218	5	Garth	Garth	NNP
1844	218	6	Gibson	Gibson	NNP
1844	218	7	,	,	,
1844	218	8	and	and	CC
1844	218	9	Randy	Randy	NNP
1844	218	10	H.	H.	NNP
1844	218	11	Katz	Katz	NNP
1844	218	12	,	,	,
1844	218	13	“	"	``
1844	218	14	A	a	DT
1844	218	15	Case	case	NN
1844	218	16	for	for	IN
1844	218	17	Redundant	Redundant	NNP
1844	218	18	Arrays	Arrays	NNP
1844	218	19	of	of	IN
1844	218	20	Inexpensive	Inexpensive	NNP
1844	218	21	Disks	Disks	NNP
1844	218	22	(	(	-LRB-
1844	218	23	RAID	RAID	NNP
1844	218	24	)	)	-RRB-
1844	218	25	,	,	,
1844	218	26	”	"	''
1844	218	27	Proceedings	proceeding	NNS
1844	218	28	of	of	IN
1844	218	29	the	the	DT
1844	218	30	1988	1988	CD
1844	218	31	ACM	ACM	NNP
1844	218	32	SIGMOD	SIGMOD	NNP
1844	218	33	International	International	NNP
1844	218	34	Conference	Conference	NNP
1844	218	35	on	on	IN
1844	218	36	Management	Management	NNP
1844	218	37	of	of	IN
1844	218	38	Data	Data	NNP
1844	218	39	(	(	-LRB-
1844	218	40	New	New	NNP
1844	218	41	York	York	NNP
1844	218	42	:	:	:
1844	218	43	ACM	ACM	NNP
1844	218	44	,	,	,
1844	218	45	2008	2008	CD
1844	218	46	)	)	-RRB-
1844	218	47	,	,	,
1844	218	48	109–16	109–16	CD
1844	218	49	,	,	,
1844	218	50	doi	doi	NN
1844	218	51	:	:	:
1844	218	52	10.1145/50202.50214	10.1145/50202.50214	CD
1844	218	53	.	.	.
1844	219	1	9	9	CD
1844	219	2	.	.	.
1844	220	1	“	"	``
1844	220	2	Features	feature	NNS
1844	220	3	—	—	:
1844	220	4	Simplify	simplify	VB
1844	220	5	Your	-PRON-	PRP$
1844	220	6	Life	life	NN
1844	220	7	,	,	,
1844	220	8	”	"	''
1844	220	9	Dropbox	dropbox	NN
1844	220	10	,	,	,
1844	220	11	http://www.dropbox.com/features	http://www.dropbox.com/features	ADD
1844	220	12	(	(	-LRB-
1844	220	13	accessed	access	VBN
1844	220	14	September	September	NNP
1844	220	15	12	12	CD
1844	220	16	,	,	,
1844	220	17	2012	2012	CD
1844	220	18	)	)	-RRB-
1844	220	19	.	.	.
1844	221	1	10	10	CD
1844	221	2	.	.	.
1844	222	1	Jose	Jose	NNP
1844	222	2	L.	L.	NNP
1844	222	3	Gonzalez	Gonzalez	NNP
1844	222	4	and	and	CC
1844	222	5	Ricardo	Ricardo	NNP
1844	222	6	Marcelin	Marcelin	NNP
1844	222	7	-	-	HYPH
1844	222	8	Jimenez	Jimenez	NNP
1844	222	9	,	,	,
1844	222	10	“	"	``
1844	222	11	Phoenix	Phoenix	NNP
1844	222	12	:	:	:
1844	222	13	A	a	DT
1844	222	14	Fault	Fault	NNP
1844	222	15	-	-	HYPH
1844	222	16	Tolerant	tolerant	JJ
1844	222	17	Distributed	distribute	VBN
1844	222	18	Web	web	NN
1844	222	19	Storage	storage	NN
1844	222	20	Based	base	VBN
1844	222	21	on	on	IN
1844	222	22	URLs	url	NNS
1844	222	23	,	,	,
1844	222	24	”	"	''
1844	222	25	in	in	IN
1844	222	26	Proceedings	Proceedings	NNP
1844	222	27	of	of	IN
1844	222	28	the	the	DT
1844	222	29	IEEE	IEEE	NNP
1844	222	30	9th	9th	NN
1844	222	31	International	International	NNP
1844	222	32	Symposium	Symposium	NNP
1844	222	33	on	on	IN
1844	222	34	Parallel	Parallel	NNP
1844	222	35	and	and	CC
1844	222	36	Distributed	distribute	VBN
1844	222	37	Processing	processing	NN
1844	222	38	with	with	IN
1844	222	39	Applications	Applications	NNPS
1844	222	40	(	(	-LRB-
1844	222	41	ISPA	ISPA	NNP
1844	222	42	,	,	,
1844	222	43	2011	2011	CD
1844	222	44	)	)	-RRB-
1844	222	45	:	:	:
1844	222	46	282–87	282–87	CD
1844	222	47	,	,	,
1844	222	48	doi	doi	XX
1844	222	49	:	:	:
1844	222	50	10.1109	10.1109	CD
1844	222	51	/	/	SYM
1844	222	52	ISPA.2011.33	ISPA.2011.33	NNP
1844	222	53	.	.	.
1844	223	1	11	11	CD
1844	223	2	.	.	.
1844	224	1	“	"	``
1844	224	2	Autobench	Autobench	NNP
1844	224	3	,	,	,
1844	224	4	”	"	''
1844	224	5	Xenoclast	Xenoclast	NNP
1844	224	6	,	,	,
1844	224	7	last	last	JJ
1844	224	8	updated	update	VBN
1844	224	9	March	March	NNP
1844	224	10	31	31	CD
1844	224	11	,	,	,
1844	224	12	2012	2012	CD
1844	224	13	,	,	,
1844	224	14	http://www.xenoclast.org/autobench	http://www.xenoclast.org/autobench	ADD
1844	224	15	(	(	-LRB-
1844	224	16	accessed	access	VBN
1844	224	17	September	September	NNP
1844	224	18	12	12	CD
1844	224	19	,	,	,
1844	224	20	2012	2012	CD
1844	224	21	)	)	-RRB-
1844	224	22	.	.	.
1844	225	1	12	12	CD
1844	225	2	.	.	.
1844	226	1	Hussam	Hussam	NNP
1844	226	2	Abu	Abu	NNP
1844	226	3	-	-	HYPH
1844	226	4	Libdeh	Libdeh	NNP
1844	226	5	,	,	,
1844	226	6	Lonnie	Lonnie	NNP
1844	226	7	Princehouse	Princehouse	NNP
1844	226	8	,	,	,
1844	226	9	and	and	CC
1844	226	10	Hakim	Hakim	NNP
1844	226	11	Weatherspoon	Weatherspoon	NNP
1844	226	12	,	,	,
1844	226	13	“	"	``
1844	226	14	RACS	RACS	NNP
1844	226	15	:	:	:
1844	226	16	A	a	DT
1844	226	17	Case	Case	NNP
1844	226	18	for	for	IN
1844	226	19	Cloud	Cloud	NNP
1844	226	20	Storage	Storage	NNP
1844	226	21	Diversity	Diversity	NNP
1844	226	22	,	,	,
1844	226	23	”	"	''
1844	226	24	in	in	IN
1844	226	25	Proceedings	Proceedings	NNP
1844	226	26	of	of	IN
1844	226	27	the	the	DT
1844	226	28	1st	1st	JJ
1844	226	29	ACM	ACM	NNP
1844	226	30	Symposium	Symposium	NNP
1844	226	31	on	on	IN
1844	226	32	Cloud	Cloud	NNP
1844	226	33	Computing	Computing	NNP
1844	226	34	(	(	-LRB-
1844	226	35	New	New	NNP
1844	226	36	York	York	NNP
1844	226	37	:	:	:
1844	226	38	ACM	ACM	NNP
1844	226	39	,	,	,
1844	226	40	2010	2010	CD
1844	226	41	)	)	-RRB-
1844	226	42	,	,	,
1844	226	43	229–40	229–40	CD
1844	226	44	,	,	,
1844	226	45	doi	doi	NN
1844	226	46	:	:	:
1844	226	47	10.1145/1807128.1807165	10.1145/1807128.1807165	CD
1844	226	48	.	.	.
1844	227	1	13	13	CD
1844	227	2	.	.	.
1844	228	1	Kevin	Kevin	NNP
1844	228	2	D.	D.	NNP
1844	228	3	Bowers	Bowers	NNP
1844	228	4	,	,	,
1844	228	5	Ari	Ari	NNP
1844	228	6	Juels	Juels	NNP
1844	228	7	,	,	,
1844	228	8	and	and	CC
1844	228	9	Alina	Alina	NNP
1844	228	10	Oprea	Oprea	NNP
1844	228	11	,	,	,
1844	228	12	“	"	``
1844	228	13	HAIL	hail	NN
1844	228	14	:	:	:
1844	228	15	A	a	DT
1844	228	16	High	High	NNP
1844	228	17	-	-	HYPH
1844	228	18	Availability	Availability	NNP
1844	228	19	and	and	CC
1844	228	20	Integrity	Integrity	NNP
1844	228	21	Layer	Layer	NNP
1844	228	22	for	for	IN
1844	228	23	Cloud	Cloud	NNP
1844	228	24	Storage	Storage	NNP
1844	228	25	,	,	,
1844	228	26	”	"	''
1844	228	27	in	in	IN
1844	228	28	Proceedings	Proceedings	NNP
1844	228	29	of	of	IN
1844	228	30	the	the	DT
1844	228	31	16th	16th	JJ
1844	228	32	ACM	ACM	NNP
1844	228	33	Conference	Conference	NNP
1844	228	34	on	on	IN
1844	228	35	Computer	Computer	NNP
1844	228	36	and	and	CC
1844	228	37	Communications	Communications	NNPS
1844	228	38	Security	Security	NNP
1844	228	39	(	(	-LRB-
1844	228	40	New	New	NNP
1844	228	41	York	York	NNP
1844	228	42	:	:	:
1844	228	43	ACM	ACM	NNP
1844	228	44	,	,	,
1844	228	45	2009	2009	CD
1844	228	46	)	)	-RRB-
1844	228	47	,	,	,
1844	228	48	187–98	187–98	CD
1844	228	49	,	,	,
1844	228	50	doi	doi	XX
1844	228	51	:	:	:
1844	228	52	10.1145/1653662.1653686	10.1145/1653662.1653686	NNS
1844	228	53	.	.	.
1844	229	1	14	14	CD
1844	229	2	.	.	.
1844	230	1	I.	I.	NNP
1844	230	2	S.	S.	NNP
1844	230	3	Reed	Reed	NNP
1844	230	4	and	and	CC
1844	230	5	G.	G.	NNP
1844	230	6	Solomon	Solomon	NNP
1844	230	7	,	,	,
1844	230	8	“	"	``
1844	230	9	Polynomial	Polynomial	NNP
1844	230	10	Codes	Codes	NNPS
1844	230	11	Over	over	IN
1844	230	12	Certain	Certain	NNP
1844	230	13	Finite	Finite	NNP
1844	230	14	Fields	Fields	NNPS
1844	230	15	,	,	,
1844	230	16	”	"	''
1844	230	17	Journal	Journal	NNP
1844	230	18	of	of	IN
1844	230	19	the	the	DT
1844	230	20	Society	Society	NNP
1844	230	21	for	for	IN
1844	230	22	Industrial	Industrial	NNP
1844	230	23	&	&	CC
1844	230	24	Applied	Applied	NNP
1844	230	25	Mathematics	Mathematics	NNP
1844	230	26	8	8	CD
1844	230	27	,	,	,
1844	230	28	no	no	UH
1844	230	29	.	.	.
1844	231	1	2	2	CD
1844	231	2	(	(	-LRB-
1844	231	3	1960	1960	CD
1844	231	4	)	)	-RRB-
1844	231	5	:	:	:
1844	231	6	300–304	300–304	LS
1844	231	7	.	.	.
1844	232	1	http://www.xenoclast.org/autobench	http://www.xenoclast.org/autobench	ADD