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1、RAID0工作原理图解及特点分析Tags:工作原理,图解,CACHE,IO,RAIDRAID0:StripedDiskArraywithoutFaultToleranceCharacteristics/Advantages1.RAID0implementsastripeddiskarray,thedataisbrokendownintoblocksandeachblockiswrittentoaseparatediskdrive2.I/OperformanceisgreatlyimprovedbyspreadingtheI/Oloadacrossmanychan
2、nelsanddrives3.Bestperformanceisachievedwhendataisstripedacrossmultiplecontrollerswithonlyonedrivepercontroller4.Noparitycalculationoverheadisinvolved5.Verysimpledesign6.EasytoimplementDisadvantages1.Nota“True”RAIDbecauseitisNOTfault-tolerant2.Thefailureofjustonedrivewillresultinalld
3、atainanarraybeinglost3.ShouldneverbeusedinmissioncriticalenvironmentsRecommendedApplications1.VideoProductionandEditing2.ImageEditing3.Pre-PressApplications4.AnyapplicationrequiringhighbandwidthRAIDLevel0requiresaminimumof2drivestoimplementRAID1工作原理图解及特点分析Tags:工作原理,图解,CACHE,IO,RAIDRA
4、ID1:MirroringandDuplexingCharacteristics/Advantages1.OneWriteortwoReadspossiblepermirroredpair2.TwicetheReadtransactionrateofsingledisks,sameWritetransactionrateassingledisks3.100%redundancyofdatameansnorebuildisnecessaryincaseofadiskfailure,justacopytothereplacementdisk4.Transferrat
5、eperblockisequaltothatofasingledisk5.Undercertaincircumstances,RAID1cansustainmultiplesimultaneousdrivefailures6.SimplestRAIDstoragesubsystemdesignDisadvantages1.HighestdiskoverheadofallRAIDtypes(100%)-inefficient2.TypicallytheRAIDfunctionisdonebysystemsoftware,loadingtheCPU/Serveran
6、dpossiblydegradingthroughputathighactivitylevels.Hardwareimplementationisstronglyrecommended3.Maynotsupporthotswapoffaileddiskwhenimplementedin“software”RecommendedApplications1.Accounting2.Payroll3.Financial4.AnyapplicationrequiringveryhighavailabilityForHighestperformance,thecontro
7、llermustbeabletoperformtwoconcurrentseparateReadspermirroredpairortwoduplicateWritespermirroredpair.RAIDLevel1requiresaminimumof2drivestoimplementRAID2工作原理图解及特点分析Tags:工作原理,图解,CACHE,IO,RAIDRAID2:HammingCodeECCCharacteristics/Advantages1.“Onthefly”dataerrorcorrection2.Extremelyhighdata
8、transferrate
