存储数据保护Raid技术DDP说明.ppt

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1、存储高级数据保护技术-DDP说明1VolumesSANtricityRAIDProtectionVolumegroupsRAID0,1,10,5,6IntermixRAIDlevelsVariousgroupsizesDynamicdiskpoolsMin11SSDsMax120SSDsUpto10diskpoolspersystem2NetAppConfidentialVolumeGroupsVolumesHostLUNsSSDsDiskPoolSSDsHostLUNsSANtricityRAIDLev

2、elsRAID0–stripedRAID5–datadisksandrotatingparityRAID1(10)–mirroredandstripedRAID6(P+Q)–datadisksandrotatingdualparity3NetAppConfidentialBlock-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、ivefailureStayinthegreenPerformancedropisminimizedfollowingdrivefailureDynamicrebalancecompletesupto8xfasterthantraditionalRAIDinrandomenvironmentsandupto2xfasterinsequentialenvironmentsLargepoolofspindlesforeveryvolumereduceshotspotsEachvolumespreadacr

8、ossalldrivesinpoolDynamicdistribution/redistributionisanondisruptivebackgroundoperation7Balanced:Algorithmrandomlyspreadsdataacrossalldrives,balancingworkloadandrebuildingifnecessary.Easy:NoRAIDoridle