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1、InternetProtocolstorageareanetworksbyP.SarkarK.VorugantiK.MethO.BiranJ.SatranThesheerscaleofthestorageneedsofmostThedeliveryofblockstoragereliedprimarilyontheorganizationsmakesblockstorageSmallComputerSystemInterface(SCSI)command2managementanimportantsystemprotocol.TheSCSIcommandprotocolattaineda
2、dministrationproblem.Applicationservers,prominenceinthis?eldprimarilybecausethispro-databases,and?lesystemsrelyonantocolwasthemostclearlyde?nedamongitspeers,ef?cientunderlyingblockstoragesystem.Theleadingtosuperiorinteroperabilityoverawiderangestorageareanetworkparadigmisfastofdevices,fromdisksto
3、tapes.Inaddition,thepro-emergingasadesirableblockstoragetocolusedmessagingprimitivesthatprovidedmod-ularityandlayeringforfastprototyping.Laterad-solution,duetoitsperformance,resource-vancementssuchassupportforcommandqueuingsharing,andcapacity-scalingbene?ts.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-
