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1、ACaseforRedundantArraysofInexpensiveDisks(RAID)DavtdAPatterson,GarthGibson,andRandyHKatzComputerSaenceD~v~smnDepartmentofElecmcalEngmeermgandComputerSclencea571EvansHallUmversityofCabformaBerkeley.CA94720(partrsl@WF-kYdu)AbstractIncreasmgperformanceofCPUsandmemorreswrllbeureofmagneuctiktechnol
2、ogy1sthegrowthmthemaxnnumnumberofsquanderedlfnotmatchedbyasunrlmpeformanceoureasemII0Whdebitsthatcanbestoredpersquaremch,orthebitspermchmatrackthecapacttyofSmgleLargeExpenstveD&T(SLED)hasgrownrapuily,umesthenumberoftrackspermchCalledMAD,formaxunalarea1theperformancermprovementofSLEDhasbeenmode
3、stRedundantdensity,theFmtLawmDiskDensitypredicts~rank87]ArraysofInexpensiveDisks(RAID),basedonthemagneticdukMAD=lo(Year-1971)/10technologydevelopedforpersonalcomputers,offersanattractivealternattveIOSLED,promtangonprovementsofanor&rofmogm&emMagnettcddtechnologyhasdoubledcapacityandhalvedpnceev
4、erythreepctformance,rehabdlty,powerconsumption,andscalalnlrtyThupaperyears,mhnewiththegrowthrateofsemiconductormemory,andmrntroducesfivclevelsofRAIDS,grvmgrheurelativecostlpetfotmance,andpracticebetween1967and1979thedtskcapacityoftheaverageIBMdatacomparesRAIDtoanIBM3380andaFupisuSuperEagleproc
5、essmgsystemmorethankeptupwithitsmammemory[Stevens81]1Background:RlsrngCPUandMemoryPerformanceCapacityISnottheo~rtymemorycharactensucthatmustgrowrapidlytomamtamsystembalance,sincethespeedwithwhichTheusersofcomputersarecurrentlyenJoymgunprecedentedgrowthmsuuctionsanddataaredeliveredtoaCPUalsodet
6、ermmesitsulamdtemthespeedofcomputersGordonBellsaidthatbetween1974and1984.perfarmanceThespeedof~mem~has~tpacefoPtworeasonssmglechipcomputersimprovedmperformanceby40%peryear,about(1)themvenuonofcaches,showmgthatasmallbuff=canbemanagedtwicetherateofmmlcomputers[Bell841InthefollowmgyearB111Joyauto
7、mamzallytocontainasubstanttalfractmnofmemoryrefaences.predictedanevenfastergrowth[Joy851(2)andtheSRAMtechnology,usedtobuildcaches,whosespeedhaslmpmvedattherateof4O%tolOO%peryearInumtmsttopnmarymemorytechnologres,theperformanceofMamframe
