15_03_00 IDC Technology Spotlight AFA Snapsot implementation will broaden use of snapshot technology_1856.pdf

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1、IDCTECHNOLOGYSPOTLIGHTAFASnapshotImplementationsWillBroadenUseofSnapshotTechnologyMarch2015AdaptedfromAComparativeLookatDisk-BasedDataProtectionandRecoveryStrategiesandCloudAdoption,IDC#246774SponsoredbyEMCSnapshottechnologieshavelongbeenapartofenterprise-classstoragearrays.Th

2、eabilitytoquicklycreatedisk-based,point-in-timecopiesofdataenablesthedatatobemoreeasilyaccessedandusedforbusinessprocessesandadministrativeoperationsacrossbothprimaryandsecondaryapplicationenvironments.Thispaperexaminesenterprise-classsnapshottechnologies,discussingusecasesfor

3、snapshotsaswellasclassicchallengesassociatedwithusingsnapshottechnologiesinpureharddiskdrive(HDD)–basedarrays.ItthenlooksatasnapshotimplementationfromEMConitsXtremIOall-flasharray(AFA),exploringtheadvantagesthatflashmediaandanewdesignpointcanprovideintheuseofsnapshottechnology

4、.IntroductionMostenterpriseskeepbetween7and10copiesoftheirproductiondata.Dependingupontheirintendeduse,thesepersistentcopiescanbecolocatedwithprimarystorageorkeptinsecondarydatastores.Enterpriseworkflowsthatcreatethesecopiesleveragedisk-based,point-in-timecopiesofproductionvol

5、umedata.Therearetwobasictypesofpersistent,disk-based,point-in-timecopies:snapshotsandclones.Snapshotsarelogicalcopiesofdataataspecificpointintimesotheycanbecreatedveryquickly.Theycanalsobeveryspaceefficientbecausenodataiscopiedupfront—justmetadatarepresentingthelogicalvolume.S

6、napshotscanbereadonlyorread/write.Thecreationofaread-onlysnapshoteffectivelyrequireslittleornospace.Duringthecreationofaread/writesnapshot,somestoragecapacityisoftenreservedtoaccommodatetheexpectedchangestothewriteablesnapshotvolume.Thus,thereisasmallamountofup-frontspaceconsu

7、mption.Twodifferentmethods,termedcopyonwriteandredirectonwrite,areusedtoaccommodatewritestotheoriginalvolumeorthesnapshots,orboth.Eachmethodhasdifferentperformanceandmanagementimplications.Withtraditionalimplementations,snapshotperformancetendstodegradeasmoresnapshotsarecreate

8、dandretained.Clonesarefullphysicalcopiesofavolumeataspecificp