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1、存儲高級數(shù)據(jù)保護(hù)技術(shù)- DDP說明1VolumesSANtricityRAIDProtectionVolumegroupsRAID0,1,10,5,6IntermixRAIDlevelsVariousgroupsizesDynamicdiskpoolsMin11SSDsMax120SSDsUpto10diskpools persystem2NetAppConfidentialVolumeGroupsVolumesHostLUNsSSDsDiskPoolSSDsHostLUNsSANtricityRAIDLev
2、elsRAID0–stripedRAID5–datadisks androtatingparityRAID1(10)– mirroredandstripedRAID6(P+Q)–data disksandrotatingdualparity3NetAppConfidentialBlock-levelstripingwithadistributedparityDataDataDataDataDataDataMirrorMirrorDataDataParityDataDataParityDataDataParit
3、yDataDataQParityParityDataDataQParityParityDataDataQParityDataDataDataTraditionalRAIDVolumesDiskdrivesorganizedintoRAIDgroupsVolumesresideacrossthedrivesinaRAIDgroupPerformanceisdictatedbythenumberofspindlesHotsparessitidleuntiladrivefailsSparecapacityis“st
4、randed”24-drivesystemwith210-drivegroups(8+2)and4hotspares4TraditionalRAID—DriveFailureDataisreconstructedontohotspareSingledriveresponsibleforallwrites(bottleneck)Reconstructionhappenslinearly(onestripeatatime)Allvolumesinthatgrouparesignificantlyimpacted2
5、4-drivesystemwith210-drivegroups(8+2)and4hotspares5TheProblemTheLarge-Disk-DriveChallengeStaggeringamountsofdatatostore,protect,accessSomesiteshavethousandsoflarge-capacitydrivesDrivefailuresarecontinual,particularlywithNL-SASdrivesProductionI/Oisimpacteddu
6、ringrebuildsUpto40%inmanycasesAsdrivecapacitiescontinuetogrow, traditionalRAIDprotectionispushedtoitslimitDrivetransferrateshavenotkeptupwithcapacitiesLargerdrivesequallongerrebuilds—anywherefrom10+hourstoseveraldays64TB+DynamicDiskPoolsMaintainSLAsduringdr
7、ivefailureStayinthegreenPerformancedropisminimized followingdrivefailureDynamicrebalancecompletesupto8xfaster thantraditionalRAIDinrandomenvironmentsandupto 2xfasterinsequentialenvironmentsLargepoolofspindlesforevery volumereduceshotspotsEachvolumespreadacr
8、ossalldrivesinpoolDynamicdistribution/redistribution isanondisruptivebackgroundoperation7Balanced:Algorithmrandomlyspreadsdataacrossalldrives,balancingworkloadandrebuildingifnecessary.Easy:NoRAIDoridle
