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【正文】 aren’tconstrainedbytheneedforeverlargercentralswitches.Gridnetworksthusreduceponentcostsandproduceareliableandresilientstructure.Applyingthegridconcepttoaputernetworkletsusharnessavailablebutunusedresourcesbydynamicallyallocatinganddeallocatingcapacity,bandwidthandprocessingamongnumerousdistributedputers.Aputinggridcanspanlocations,organizations,machinearchitecturesandsoftwareboundaries,offeringpower,collaborationandinformationaccesstoconnectedusers.UniversitiesandresearchfacilitiesareusinggridstobuildwhatamountstosuperputercapabilityfromPCs,MacintoshesandLinuxboxes.Aftergridputingcameintobeing,itwasonlyamatteroftimebeforeasimilarmodelwouldWhatIsGridStorage? Basedoncurrentandproposedproducts,itappearsthatagridstoragesystemshouldincludethefollowing:Modularstoragearrays:ThesesystemsareconnectedacrossastoragenetworkusingserialATAdisks.Thesystemscanbeblockorientedstoragearraysornetworkattachedstoragegatewaysandservers.Commonvirtualizationlayer:Storagemustbeorganizedasasinglelogicalpoolofresourcesavailabletousers.Dataredundancyandavailability:Multiplecopiesofdatashouldexistacrossnodesinthegrid,creatingredundantdataaccessandavailabilityincaseofaponentfailure.Commonmanagement:Asinglelevelofmanagementacrossallnodesshouldcovertheareasofdatasecurity,mobilityandmigration,capacityondemand,andprovisioning.Simplifiedplatform/managementarchitecture:Becausemonmanagementissoimportant,thetasksinvolvedinadministrationshouldbeorganizedinmodularfashion,allowingtheautodiscoveryofnewnodesinthegridandautomatingvolumeandfilemanagement.ThreeBasicBenefitsApplyinggridtopologytoastoragenetworkprovidesseveralbenefits,includingthefollowing:Reliability.Awelldesignedgridnetworkisextremelyresilient.Ratherthanprovidingjusttwopathsbetweenanytwonodes,thegridoffersmultiplepathsbetweeneachstoragenode.Thismakesiteasytoserviceandreplaceponentsincaseoffailure,withminimalimpactonsystemavailabilityordowntime.Performance.Thesamefactorsthatleadtoreliabilityalsocanimproveperformance.Notrequiringacentralizedswitchwithmanyportseliminatesapotentialperformancebottleneck,andapplyingloadbalancingtechniquestothemultiplepathsavailableoffersconsistentperformancefortheentirenetwork.Scalability.It’seasytoexpandagridnetworkusinginexpensiveswitcheswithlowportcountstoacmodate
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