internet protocol storage area networks

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1、InternetProtocolstorageareanetworksbyP.SarkarK.VorugantiK.MethO.BiranJ.SatranThesheerscaleofthestorageneedsofmostThedeliveryofblockstoragereliedprimarilyontheorganizationsmakesblockstorageSmallComputerSystemInterface(SCSI)command2managementanimportantsystemprotocol.TheSCSIcommandprotocolattaineda

2、dministrationproblem.Applicationservers,prominenceinthisfieldprimarilybecausethispro-databases,andfilesystemsrelyonantocolwasthemostclearlydefinedamongitspeers,efficientunderlyingblockstoragesystem.Theleadingtosuperiorinteroperabilityoverawiderangestorageareanetworkparadigmisfastofdevices,fromdisksto

3、tapes.Inaddition,thepro-emergingasadesirableblockstoragetocolusedmessagingprimitivesthatprovidedmod-ularityandlayeringforfastprototyping.Laterad-solution,duetoitsperformance,resource-vancementssuchassupportforcommandqueuingsharing,andcapacity-scalingbenefits.Thisandoverlappingcommandsledtosuperior

4、perfor-papershowsthattheubiquitousInternetmance.Protocol(IP)networkistechnicallywell-suitedtohostastorageareanetwork.ThepaperThepreferredtransportfortheSCSIcommandpro-presentsthestorageprotocol,management,tocolintheserver-attachedstoragemodelwaspar-andsecuritybuildingblocksthatareallelSCSI,wheret

5、hestoragedeviceswereconnectednecessaryformakingIPstorageareality.Thetothehostserverviaacable-basedparallelbus.How-paperthendiscussesperformanceissuesthatever,astheneedforstorageandserversgrew,themustbeaddressedinordertomakeIPlimitationsofthistechnologybecameobvious.First,storageareanetworkscompet

6、itivewithothercontentionforaccesstotheparallelbuslimitsthestorageareanetworktechnologies.numberofstoragedevicesthatcanbeattachedtoeachcable.Second,thephysicalcharacteristicsofthecablealsolimitthedistanceofthestoragede-vicesfromthehostserver.Theselimitsimplythattheadditionofnewstoragedevicesmightr

7、equirethepurchaseofahostserverforattachingthestor-Inthepast,storagemodelsassumedthepresenceage.Third,attachingstoragetoeveryhostserverofblockstorageattachedtoeveryhostserver.Blockmeansthatthestoragemustbemanagedonaper-