存储数据保护Raid技术DDP说明.pptx

存储数据保护Raid技术DDP说明.pptx

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,存储高级数据保护技术-DDP说明,1,Volumes,SANtricityRAIDProtection,VolumegroupsRAID0,1,10,5,6IntermixRAIDlevelsVariousgroupsizesDynamicdiskpoolsMin11SSDsMax120SSDsUpto10diskpoolspersystem,2,NetAppConfidential,VolumeGroups,Volumes,HostLUNs,SSDs,DiskPool,SSDs,HostLUNs,SANtricityRAIDLevels,RAID0stripedRAID5datadisksandrotatingparity,RAID1（10）mirroredandstripedRAID6（P+Q）datadisksandrotatingdualparity,3,NetAppConfidential,Block-levelstripingwithadistributedparity,TraditionalRAIDVolumes,DiskdrivesorganizedintoRAIDgroupsVolumesresideacrossthedrivesinaRAIDgroupPerformanceisdictatedbythenumberofspindlesHotsparessitidleuntiladrivefailsSparecapacityis“stranded”,24-drivesystemwith210-drivegroups（8+2）and4hotspares,4,TraditionalRAIDDriveFailure,DataisreconstructedontohotspareSingledriveresponsibleforallwrites（bottleneck）Reconstructionhappenslinearly（onestripeatatime）Allvolumesinthatgrouparesignificantlyimpacted,24-drivesystemwith210-drivegroups（8+2）and4hotspares,5,TheProblem,TheLarge-Disk-DriveChallengeStaggeringamountsofdatatostore,protect,accessSomesiteshavethousandsoflarge-capacitydrivesDrivefailuresarecontinual,particularlywithNL-SASdrivesProductionI/OisimpactedduringrebuildsUpto40%inmanycasesAsdrivecapacitiescontinuetogrow,traditionalRAIDprotectionispushedtoitslimitDrivetransferrateshavenotkeptupwithcapacitiesLargerdrivesequallongerrebuildsanywherefrom10+hourstoseveraldays,6,4TB+,DynamicDiskPools,MaintainSLAsduringdrivefailureStayinthegreenPerformancedropisminimizedfollowingdrivefailureDynamicrebalancecompletesupto8xfasterthantraditionalRAIDinrandomenvironmentsandupto2xfasterinsequentialenvironmentsLargepoolofspindlesforeveryvolumereduceshotspotsEachvolumespreadacrossalldrivesinpoolDynamicdistribution/redistributionisanondisruptivebackgroundoperation,7,Balanced:

Algorithmrandomlyspreadsdataacrossalldrives,balancingworkloadandrebuildingifnecessary.,Easy:

NoRAIDoridlesparestomanageactivesparecapacityonalldrives.,Combiningeffort:

Alldrivesinthepoolsustaintheworkloadperfectforvirtualmixedworkloadsorfastreconstructionifneeded.,Flexible:

AddANY*numberofdrivesforadditionalcapacitysystemautomaticallyrebalancesdataforoptimalperformance.,TraditionalRAIDTechnology,InnovativeDynamicDiskPools,8,“WithDynamicDiskPools,youcanaddorlosediskdriveswithoutimpact,reconfiguration,orheadaches.”,*Aftertheminimumof11.,9,DataRebalancinginMinutesvs.Days,Hours,2.5Days,1.3Days,Typicalrebalancingimprovementsarebasedona24-diskmixedworkload,Morethan4Days,BusinessImpact,99%ExposureImprovement,MaintainbusinessSLAswithadrivefailure,RAIDLevelComparison,10,NetAppConfidential,DynamicDiskPoolsOverview,DDPdynamicallydistributesdata,sparecapacity,andparityinformationacrossapoolofSSDsAlldrivesareactive（noidlehotspares）SparecapacityisavailabletoallvolumesDataisdynamicallyrecreated/redistributedwheneverpoolsgrowsorshrinks,11,NetAppConfidential,DDP:

Simplicity,Performance,Protection,SimplifiedadministrationNoRAIDsetsorhotsparestomanageDataisautomaticallybalancedwithinpoolFlexiblediskpoolsizingoptimizescapacityutilizationConsistentperformanceDataisdistributedthroughputthepool（nohotspots）PerformancedropisminimizedduringadriverebuildSignificantlyfasterreturntooptimalstateRelentlessdataprotectionSignificantlyfasterrebuildtimesasdataisreconstructedthroughoutthediskpoolPrioritizedreconstructionminimizesexposure,12,NetAppConfidential,DDPInsight:

HowItWorks,EachDDPvolumeiscomposedofsomenumberof4GB“virtualstripes”calleddynamicstripesEachD-striperesidesonapseudo-randomlyselectedsetof10drivesfromwithinthepoolD-stripesareallocatedattimeofvolumecreationandallocatedsequentiallyonaper-volumebasis,13,NetAppConfidential,24-SSDpool,DDPSSDFailure,ForeachD-StripewhichhasdataonfailedSSD:

SegmentsonotherSSDsarereadtorecreatedataAnewSSDischosentowritesegmentsfromfailedSSDRebuildoperationsruninparallelacrossallSSDs,14,NetAppConfidential,DDPMultipleDiskFailure,IftwoSSDshavefailedsystemwillrebuildcriticalsegmentsfirstBrownandLightBlue,15,NetAppConfidential,IfadditionalSSDsfailnewcriticalsegmentswillbeidentifiedandrebuiltBlue,OrangeandPink,DDPAddingSSDsToPool,AddasingleSSDoraddmultipleSSDssimultaneouslyImmediatelyrebalancesdatatomaintainequilibriumSegmentsarejustmoved（doesnotreconstructRAID）,16,NetAppConfidential,23-SSDpool,DynamicStripe:

ACloserLook,DataiswrittenwithinaD-stripeusingRAID6EachRAID6stripeis1MB（8+2with128Ksegmentsize）EachD-stripehas4,096traditionalRAID6stripesAD-pieceisonedrivesworthofD-stripedata,17,NetAp