企业存储集团IT简报如何建立分级化存储策略

AnITBriefingproducedbySponsoredBy:ABlueprintforTieredStorage©2004TechTargetBIOSCopyright©AppleComputerInc.2004.Allrightsreserved.Reproduction,adaptation,ortranslationwithoutpriorwrittenpermissionisprohibited,exceptasallowedunderthecopyrightlaws.AboutTechTargetITBriefingsTechTargetITBriefingsprovidethepertinentinformationthatsenior-levelITexecutivesandmanagersneedtomakeeducatedpurchasingdecisions.Originatingfromourindustry-leadingVendorConnectionandExpertWebcasts,TechTarget-producedITBriefingsturnwebcastsintoeasy-to-followtechnicalbriefs,similartoawhitepaper.DesignCopyright©2003TechTarget.Allrightsreserved.Forinquiriesandadditionalinformation,contact:TinaHillsDirectorofProductMarketing,Webcasts,[e-mail]orageBySteveDuplessieSteveDuplessie—SteveistheFounderandSeniorAnalystoftheEnterpriseStorageGroup,recognizedworldwideastheleadingindependentauthorityonenterprisestorage.StevehasalsoconsistentlybeenrankedasoneofthemostinfluentialITanalysts.PriortofoundingESG,StevewastheFounderandCEOofInvincibleTechnologiesCorp.,amanufactureroffault-tolerantNASSystems.PriortoITC,SteveheldpositionsatClearpointResearchandEMCCorporation.ThisITBriefingisbasedonanAppleComputer/TechTargetwebcast,“ABlueprintforTieredStorage.”Toviewthiswebcastonline,pleaseclickthelink.ThisTechTargetITBriefingcoversthefollowingtopics:•WhatisInformationLifecycleManagement(ILM)?...........1•DataLifecycleManagement(DLM)......................1•DecisioncriteriaforDLM...................................4•SellingDLMinsidetheorganization..........................5•BuildingaDLMInfrastructure...............................6•DLMvalueproposition....................................61ITBriefing:ABlueprintforTieredStorageSponsoredBy:ABlueprintforTieredStorageWhatisInformationLifecycleManagement(ILM)?InformationLifecycleManagement(ILM)isgettingalotofattentioninthepresstoday.Morethanany-thing,ILMisaprocess.Today,andinthepast,thatprocessconsistsofInformationTechnologystaffmakingconsciousorunconsciousdecisionsaboutwhatdatashouldresidewhereinthephysicalinfra-structureandhowtooptimizeforusebytheappro-priateapplicationattherighttime.ILMatpresentisaconceptmorethanaproduct.Severalproducts,tools,andservicesencompassacompany’stotalILMstrategy.ILMisaprocessinwhichpeople,processes,andtechnologiesdealwithdatafromcradletograve.Datahasdifferentvalueatinceptionthanitdoesatdeath,soitshouldn'tbetreatedthesamewayduringeachphaseofitslifetime.TodaymostsolutionsbeingsoldasInformationLife-cycleManagementfocusondatamigrationordatamovement,aswellastheretentionandprotectionaspectsofwheredataresides.Thisconcernsthedis-tinctionbetweenDataLifecycleManagement(DLM)vs.ILM.DLMistheinfrastructuralelementandILMisthemacro-levelelementthatassignsbothsubjec-tiveandobjectivevalue.ILMrelatesnotonlytoanapplication,butalsotowheretheinformationitselfresidesinthecompanyasawhole.DLM—theinfrastructuralpieceofwhatgoeswhereandwhen—isverysimilartothetraditionalHierar-chicalStorageManagement(HSM)thathasexistedinthemainframeworldsinceinception.TheprimarydifferenceisthatHSMwasasingle-server,single-storagestackmethodologyformovingthingsdown(usually)thatphysicalstackinordertolowerthecostofprimarystorage.HSMisstillusedtodayinthemainframeworldandhadlimitedsuccessinsomeoftheopenandtraditionalworld.DLMisHSMinthenetworkworldwheretherearelotsofwaysintoandoutofastorageenvironmentfromamultitudeofpotentialservers,andeachserverhasamultitudeofdifferentwaysinandout.HSMwasmoreofasinglestovepipe.WithDLMyoucanthinkoftoday’snet-workstorageworld.TheHSMdatamigrationtechnologiesofthepastwerepredicatedonpurelyobjectivemeasures.Forexample,youmighthaveapolicythatifyouhavenotaccessedafileortypeofdatainacertainperiodoftime,thedatashouldbemovedfromexpensivepri-marystoragetolessexpensivetapestorage.Thatworkswellifallthevalueispredicatedonthoseobjectivemeasures.Unfortunately,todaythatisnottrueinmostapplications.Valueisnotonlyobjectivebutitissubjective.Justbecauseaccessmightbelim-itedtoacertaindatasetdoesnotnecessarilymeanthatdatasetlacksgreatvaluetotheorganization.Conversely,datathatyouaccessallthetime(suchasPowerPoint,forexample)maynotbethemostimportantapplication,inspiteofthefrequencyofaccess.ILMaimstousethecombinationofbothsubjectiveandobjectivemeasures—thedataitselfcombinedwithoverallbusinesspolicies,(whichtypicallydon’texisttoday)toascertainwherethingsarelocatedataparticularpointintime.SinceILMisforthemostpartaconceptratherthanembodiedinconcreteprojects,thisbalanceofthiswhitepaperwillbecon-finedtoDLM.DataLifecycleManagement(DLM)DLMarchitecturesalmostexclusivelycomprisetwophysicaltiers(seeFigure1).Thereisthephysicaltierofactualstoragewheredataresides,includingdiskarraysofallsizesandtapes,andthenthereistheprocesstierformovingdatabetweenthoseelements.Today,byandlarge,thephysicaltierinvolvesmanualprocesses.TieredstorageforDLMarchitecturesarenotone-size-fits-all.Theeconomicdownturnofthelastfewyearshasresultedinasortoftechnologicalrenais-sance.Wenowhaveinexpensivearraysandotherproductsthatcanbejustaseffective