CelerraPPTNote.docx

CelerraPPTNote.docx

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CelerraPPTNote

NotetoPresenter:

ViewinSlideShowmodeforanimation.

CelerraSnapSurecreatespoint-in-timelogicalview（s）ofaproductionfilesystem.Thelogicalviewofafilesystemisreferredtoasasnap.

RecentCelerraSnapSureenhancementsincludethefollowing:

•Accessiblefromtheproductionfilesystem—Afterasnapiscreatedandmounted,alllevelsoftheproductionfilesystemwillautomaticallycontainanhiddenentryoftheform“.ckpt_.”ThisreducestheburdenontheSystemAdministratorbyenablinganyusertoretrieveolderversionsoffilesordirectoriesthatmatchtheuser’saccessprivileges.Theretrievalprocessallowssimplenavigationthroughread-onlydirectoriesontheproductionfilesystem.

—Operationalspecifics:

•Placesahidden.ckptdirectoryundereverydirectoryontheproductionfilesystem

•Placesalistofvirtuallinksinsidethis.ckptdirectory,eachofthemlinktoaCelerraSnapSureversionofthisdirectory

•NFSandCIFSaccess

—Example:

•/.ckpt/05200201.bck/fooistheversionoffile/filenameontheSnapSuretakenon05/20/2008

•/.ckpt/05210201.bck/fooistheversionoffile/filenameontheSnapSuretakenon05/21/2008

—ThevirtualCheckpointFilesystemtakesnostorage;itcalculatesthelistofentriesitneedstoshowinthe“.ckpt”directorybytheinodenumberof“/dir”andthesystemSnapSuretable.

•SingleSavVol—AllsnapsofaproductionfilesystemwillusethesameSaveVolume,thesourcepoolofwhichisuser-configurable.

•Automaticextension—IfaSaveVolumebecomesfull,thenSnapSureextendsitautomatically.Thiseventistriggeredwhenthehighwatermarkisreached.Thehighwatermarkisconfigurable;iftheSaveVolumecannotbeextended,SnapSurewilldeletetheoldestsnapanditsspacewillthenbereused.

•Onlineinstantrestoreoftheproductionfilesystemfromanysnap—SnapSurefreezestheproductionfilesystem,whichflushesandsuspendsallactivity（readandwrite）beforeimmediatelystartingtherestore;thenthawstheproductionfilesystem（thisoperationisrequiredbecausetherestoreoperationmodifiestheproductionfilesystemstructure）.Then,inthebackground,SnapSurerestorestheproductionfilesystemtothesnap,copyingtherequireddatablocksbackwhiletheproductionfilesystemcontinuesitsactivity（readandwriteoperations）.（NotetoPresenter:

Whenarestoreisstarted,anewsnapisautomaticallycreatedontheproductionfilesystemincasearollbackisrequested.）

•Deleteoutoforder—Allowsscheduledsnapstooperatemoreefficiently（e.g.,candeletedailysnapsbetweentwoweeklysnaps）.

WithDART5.6,CelerraSnapSureforNASfilesystemshasbeenenhancedtosupportwriteablesnaps,whichareidealforcreatingtestenvironmentsfordatabasesandfiles.Aftertesting,thechangescaneitherbediscardedornon-destructivelyappliedtotheproductiondata.

Celerrasupportsupto16writeablesnapsperproductionfilesystem,whichisinadditiontothe96supportedread-onlysnapsperfilesystem.

Itisnotpossibletomakemorethanonewriteablesnapfromasinglebase（read-only）snap,andyoucannotsnapawriteablesnap.

AllupdatestowriteablefilesystemsnapcopiesarestoredintheSavVol.

NotetoPresenter:

Inthiscase,non-destructivereferstothefactthattheproductionfilesystemisitselfsnappedpriortorestoresothataroll-backoftherestorecanbemadeifitisdeemedthattherestorewasperformedbymistake.

CelerraManagerBasicEditionhasscreensthatpermitAdministratorstospecifyhowcheckpointsshouldbescheduledandthefrequencyofrefresh.

TheAdministratorindicateswhenthesnapshotsshouldoccur,alongwiththemaximumnumberofcheckpointstokeep.Forexample,ifyouwanttomaintainsevendaysofcheckpointsonaparticularfilesystem,youwouldscheduleanightlysnapshotandchoosetoalwayskeepsevencheckpoints.

Inaddition,throughintegrationwithMicrosoftShadowCopyforSharedFolders,userscanperformfile-levelrestoresusingMicrosoftExplorer’s“PreviousVersions”Propertytab.

Forapplication-consistentiSCSIsnapshotmanagement（SQL,Exchange,Oracle）,EMCReplicationManagercanbeused.

CelerraReplicatorprovidesefficient,asynchronousdatareplicationoverInternetProtocol（IP）networks.WithCelerraReplicator,youcancreatepoint-in-time,NASfilesystemcopiesandconsistentiSCSILUNcopiesonlocalorremotesites.

•WithCelerraReplicator,boththeproductiondataandreplicaareaccessibleatalltimes.

•AninitialcopycanbemadeoverthenetworkorbyphysicallytransportingtheimageviatapeoranadditionalCelerratotheremotelocation.

•Aftertheinitialsynchronization,CelerraReplicatorusesdifferentialsnapshotstosendonlythechangesoverthewire.

•CelerraReplicatorsupportsapplication-consistentiSCSIreplication.ThehostcaninitiatethereplicationviaReplicationManager.

•ForCIFSenvironments,theVirtualDataMover（VDM）functionalityensuresthatthenecessarycontextisreplicatedtotheremotesitealongwiththefilesystems.ThisincludesCIFSserverdata,auditlogs,andlocalgroups.

•Forasynchronousdatarecovery,thesecondarycopycanbemaderead/write,andproductioncancontinueattheremotesite.Iftheprimarysystembecomesavailable,incrementalchangesatthesecondarycopycanbeplayedbacktotheprimarywiththere-synchronizationfunction.

NotetoPresenter:

Afterafailovertothesecondary,transactionscanbelostdependingonthesynchronizationpointbetweenprimaryandsecondary.

WithDART5.6andgreater,CelerraReplicatoradvancesIPstorageprotectionwithasetofkeyenhancements,including:

•Automatedservice-leveldefinitions—AdministratorscanimplementRPOsforreplicatedfilesystemsbysimplysettingtheMaximumTimeOutofSyncparameterintheCelerraManager.CelerraReplicatorwillautomaticallyscheduleupdatestomeetthisservicelevel.Iftheservicelevelcannotbemet,analertwillbegenerated.Thisenhancementallowsuserstodefinedisasterrecoveryservicelevelsdirectlyfrombusinesspolicies.

•Policy-based,adaptiveQualityofServiceforreplicationinterconnects—Thesource-to-destinationIPnetworkinterconnectscanbethrottledbyspecifyingascheduleoftimes,days,andbandwidthlimits.ThisenhancementallowsAdministratorstodefineremotesitenetworkbandwidthutilizationdirectlyfrombusinesspolicies.

•1-to-nreplication—CelerraReplicatorcansimultaneouslyreplicateasinglesourceacrossn（maximumoffour）sites.Thisisidealfordistributingsharedinformationforengineeringandsoftwaredevelopment,companieswithmultipledisasterrecoverysites,andformultipleremotetestenvironments.

•CascadingReplication—Formulti-sitedisasterrecoveryenvironments,Celerracanreplicatetoasecondarysite,andreplicatefromthesecondarysitetoatertiarysite.ThisisidealfortieredreplicationwherethenearbydisasterrecoverysiterequiresanRPOofminutesandthefardisasterrecoverysiterequiresanRPOofhours.Thisdeploymentmaintainsdisasterrecoverycomplianceifanysiteislost,andcanrecoverfromthelossoftwosites.

•Improvedscalability—Upto1,024replicationsessionsisa16timesincreaseinthenumberofconfiguredreplicationsessions.AdministratorscanprotectextremelylargeIPstoragedeploymentsorhavefinergranularityinsegmentingtheirinformationbyRTO/RPOrequirements.

•Commonreplicationmanagement—CelerraManagernowsupportsallreplicationtypes—filesystem,VDM,oriSCSI.Now,replicationsessionsaredisplayedinaconsistentmannerwithintheCelerraManager.

NotetoPresenter:

ReplicationManageraddssignificantvaluewhenapplicationintegrationisrequiredforiSCSI-consistentreplicas.

•Integrateswithwritablesnaps—CelerraSnapSurehasbeenenhancedtosupportwriteablesnaps—idealforcreatingtestenvironmentsfordatabasesandfiles.ThesewritablesnapscanbetakenagainstCelerraReplicatorcopies.

HowdoesCelerraMPFSintegratebothSANandNAS?

Let’slookattheexampleonthisslide.theapplicationserversareattachedtoeitheraCelerraNS-G8orNS-G2gatewaythroughtheIPnetwork—thisisalsoaclassicNASoption.NotealsothattheapplicationserversarealsoconnectedtotheSAN（viaFibreChanneloriSCSI）.ThecontentisbothconsolidatedandsharedthroughtheCLARiiONorSymmetrix,andtheCelerraNS-G8orNS-G2andtheserversusetheSANtoaccessthestorage.ThisSANinfrastructurewillfacilitatetheseamlessexpansionofbothadditionalstorageandadditionalserversinthefuture.

NotetoPresenter:

ClicknowinSlideShowmodeforanimation.

InthisexamplenotethattheapplicationserversareattachedtoeitheraCelerraNS-120,NS-480orNS-960viatheIPnetwork.AlsonotethattheapplicationserversareconnectedviaFibreChanneloriSCSItotheCelerraUnifiedStorageplatform.ThisisaclassicNASdeployment.Inthisexample,thedatarequestisdoneviatheIPnetwork,andthedataisthendeliveredviaFibreChanneloriSCSI.

NotetoPresenter:

Refertothe“EMCE-LabInteroperabilityNavigator”onPowerlinkforthecurrentlistofsupportedCelerraMPFSclientoperatingsystemsandrevisions.

CelerraMPFSusestheIPnetworktorequestinformationfromstorage.WithCelerraMPFS,servershavetwomethodsofreceivinginformationfromstorage—throughNASorthroughtheSAN.

CelerraMPFSfeaturesare:

•ImprovedIOthroughputovertraditionalNAS—EventhoughNASoffersimpressivebandwidth,demandingapplicationsrequireconsistent,predictableperformancethatcanbeassuredonlythroughtheuseofblocktechnology

•Supportsstandardfile-accessprotocols（NFSandCIFS）—AsCelerraMPFSusesNAStechnology,itsuserss