Vplex產(chǎn)品與技術(shù)手冊課件

Module1:VPLEXProductandTechnologyDetailsCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview1DescribecommonVPLEXterminologyandconfigurationsDescribetheVPLEXproducthardwareandsoftwarearchitectureDescribehowVPLEXintegratesintoanexistingenvironmentListanddescribevarioususecasesforVPLEXDescribethelifeofanI/OoperationinVPLEXModule1:VPLEXProductandTeVPLEXProductandTechnologyDetailsCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview2VPLEXTerminology,Capabilities,andUseCasesListanddefinecommonVPLEXterminologyDescribeVPLEXarchitecture,capabilities,LocalandDistributedFederationandVPLEXusecasesVPLEXProductandTechnologyDVPLEXTerminologyCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview3TermDefinitionStorageVirtualizationIsavirtuallayerbetweenhostsandstorage,abstractingthephysicalelementsintologicalviewswithinasinglesite.VirtualStorageTheseparationofinformationfromphysicalstoragemediaandlocation.VirtualStorageisnotstoragevirtualization.Itallowstheseamlessmobilitybetweenthedatacenterandcloud.LocalFederationProvidesthetransparentcooperationandmobilitybetweenstorageelementstoenabledatatobeshared,accessed,andrelocatedtransparentlywithinasinglesite.DistributedFederationProvidesthetransparentcooperationandmobilitybetweenstorageelementstoenabledatatobeshared,accessed,andrelocatedtransparentlybetweentwolocationsatsynchronousdistances.EMCVPLEX?FamilyTheworldsfirstlocalanddistributedfederationplatformVPLEXLocal?ProvidestransparentcooperationandmobilityofphysicalelementswithinasiteVPLEXMetro?Extendsaccessbetweentwolocationsatsynchronousdistanceswithlessthan5mslatencyVPLEXTerminologyCopyright?2VPLEXTerminologycontinuedCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview4TermDefinitionVPLEXGeo?Addssupportdatamobilityandaccessbetweentwositesoverextendedasynchronousdistancesandisplannedfor2011.VPLEXGlobal?Datamobilityandaccess“anywhere”.VPLEXGlobalwillincludemultiplelocationsandserviceproviderswithunlimiteddistancesandisplannedforafuturerelease.CacheCoherencyIstheconsistencyofdatastoredinlocalcachesofasharedresourceDistributedCacheCoherencyProvidesautomaticsharing,balancing,andfailoverofI/OacrosstheclusterAccessAnywhere?Cachecoherencytechnologythatenablesaconsistentviewofdatatobepresented,shared,accessed,andorrelocatedbetweenfederatedVPLEXMetroclustersGeoSynchrony?SoftwarethatrunsontheVPLEXhardwareMetadataVolumeAvolumethatcontainsvirtual-to-physicalmappinginformation.EveryVPLEXclusterrequiresaMetadatavolume.LoggingVolumeAvolumeusedtokeeptrackofchangestoadistributeddevice.VPLEXTerminologycontinuedCopVPLEXTerminologycontinuedCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview5TermDefinitionStorageVolumeTheunderlyingphysicalblockstoragevolumepresentedfromthearraytoVPLEX.StoragevolumesarealsoknownasarrayLUNs.ExtentThefirstlevelofpresentationofastoragevolume,whichcanbedividedintomultipleextentsorasingleextent(iftheentirestoragevolume’scapacityisused)DeviceAstorageobjectformedfromoneormoreextentsordevices.AdevicesalsohasaRAIDlevelof0,1,orC.Devicescanbeusedtocreatevirtualvolumes.VirtualVolumeAVPLEXvolumethatiscreatedandpresentedtothehost.Thisvolumehasaone-to-onerelationwithadevice.DistributedVolumeAvolumewithcompletesynchronizedcopiesofdata(mirrors)inmorethanoneclusterStorageViewAviewforhoststhatdefineswhichhostscanaccesswhichvirtualvolumesonwhichVPLEXportsVPLEXEngineConsistsoftwohigh-availabilitydirectors,redundantpowersupplies,integratedbatterybackup,and“CallHome”andremotesupport.VPLEXTerminologycontinuedCopEMCVisionforVirtualStorageCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview6EfficientSecureAlways-onAutomatedOn-DemandIntegratedFAST+Federation+StorageVirtualizationPhysicalStorageCapabilitiesthatfreeinformation

fromphysicalstorageEMCVisionforVirtualStorageJourneytothePrivateCloudCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview7JourneytothePrivateCloudCoVPLEXProductFamilyCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview8VPLEXGlobalMorethantwositesAnywhereVPLEXGeoTwositesExtendedDistanceAsynchronousClusterWitnessVPLEXMetroUptoeightenginesUpto16,000LUNsTwositesUpto5mslatencyVPLEXLocalOnetofourengines8,000LUNsSingleSiteDataCenterVPLEX4VPLEX5LaterVPLEXProductFamilyCopyrightVPLEXArchitectureNextGenerationDataMobilityandAccessScaleOutClusterArchitectureStartsmallandgrowbigwithpredictableservicelevelsAdvancedDataCachingImproveI/OperformanceandreducestoragearraycontentionPrefetchOperationsDistributedCacheCoherenceAutomaticsharing,balancingandfailoverofstoragedomainswithinandacrossVPLEXEnginesCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview9LocalandDistributedFederationAccessAnywhereVPLEXArchitectureNextGeneratVPLEXLocalOverviewSimplifyprovisioningandvolumemanagementCentralizemanagementofblockstorageinthedatacenterPhysicalstorageneedstobeprovisionedoncetothevirtualizationlayerNon-disruptivedatamobilityOptimizeperformance,redistributeandbalanceworkloadsamongarraysDomainFailureCanprotectagainstfailuredomainssuchasanentirearraygoingdownWorkloadresiliencyImprovereliability,scaleoutperformanceStoragepoolingManageavailablecapacityacrossmultipleframesbasedonSLAsCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview10MigrateVPLEXLocalOverviewSimplifypVPLEXLocalConfigurationOneRack1–4EnginesFullyredundanthardwareN+1performanceandscalingMoreportsandmoreengines1+NfaulttoleranceAlldirectorsbutonecanfailwithoutcausingDataU/DataLossCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview

11SPS8-portFCswitch8-portFCswitchSPSSPSSPSUPSUPSManagementserverVPLEXLocalConfigurationOneRVPLEXMetroOverviewAccessAnywhere:Blockstorageaccesswithin,betweenandacrossdatacentersWithinsynchronousdistancesLessthan5mseclatencyrequiredConnecttwoVPLEXstorageclusterstogetheroverdistanceEnablesvirtualvolumestobesharedbybothclustersProvidesuniquedistributedcachecoherencyforallreadsandwritesBothclustersmaintainthesameidentityforavolume,andpreservethesameSCSIstateforthelogicalunitEnablesVMwareVMotionoverdistance,fasterthanStorageMotionCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview12AccessAnywhereRemoteAccessorMigrateVPLEXMetroOverviewAccessAnywVPLEXMetroConfigurationTwoRacksoffullyredundanthardware2to8EnginestotalinaVPLEXMetroEachrackcanconsistof1–4enginesFC-WAN8GbFibreChannelports4perengine/2perdirectorCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview

135msinroundtriplatencySPS8-portFCswitch8-portFCswitchSPSSPSSPSUPSUPSManagementserverSPS8-portFCswitch8-portFCswitchSPSSPSSPSUPSUPSManagementserverAccessAnywhereSynchronousVPLEXMetroConfigurationTwoRVPLEXGeoOverviewAccessAnywhereBlockstorageaccesswithin,betweenandacrossdatacentersWithinasynchronousdistancesMax50msround-triplatencyEnablesvirtualvolumestobesharedbybothclustersProvidesuniquedistributedcachecoherencyforallreadsandwritesBothclustersmaintainthesameidentityforavolume,andpreservethesameSCSIstateforthelogicalunitCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview14RemoteAccessorMigrateVPLEXGeoOverviewAccessAnywheVPLEXGeoConfigurationTwoRacksoffullyredundanthardware2to8EnginestotalinaVPLEXGeoEachrackcanconsistof1–4enginesIP-WAN10Gb(1Gb)Ethernetports4perengine/2perdirectorCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview

1550msinroundtriplatencySPS8-portFCswitch8-portFCswitchSPSSPSSPSUPSUPSManagementserverSPS8-portFCswitch8-portFCswitchSPSSPSSPSUPSUPSManagementserverAccessAnywhereAsynchronousVPLEXGeoConfigurationTwoRacTypicalVPLEXUseCasesDatacenterconsolidationZerodowntimedatacenterRelocationAbilitytomoveVM/datatonewdatacenterwithnodowntimeDecommissiontheoriginaldatacenterDistributedloadbalancingPre-emptivedisasteravoidanceZerodowntimemaintenanceLeaserolloversCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview16TypicalVPLEXUseCasesDataceVPLEXLocalTargetUseCasesCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview17MobilitySimplifyManagementPoolStorageMOBILITYVPLEXLocalTargetUseCasesCoVPLEXRemoteTargetUseCasesCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview18MobilityShareDataHighAvailabilityVMClusterAClusterBSync/AsyncSync/AsyncVMSync/AsyncVPLEXRemoteTargetUseCasesCVPLEXProductandTechnologyDetailsCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview19VPLEX4.XArchitectureListanddefineVPLEX4.XhardwareandsoftwarearchitectureDescribeproductpackagingDefinehowVPLEXVPLEX4.XmapsnativearrayvolumestoVPLEXvirtualvolumesVPLEXProductandTechnologyDVPLEXMetroVPNCreatesasecureconnectbetweenthetwomanagementserversUsesx.509certificatesand2048-bitRSAencryptionConfiguredandsetupduringinstallationwhenusingtheEZSetupWizardCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview20VPLEXMetroVPNCreatesasecurVPLEXArchitectureCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview21Virtual

VolumeVirtual

VolumeVirtual

VolumeVPLEX

BE

PortVPLEX

BE

PortVPLEX

BE

PortStorage

VolumeStorage

VolumeStorage

VolumeManagement

ServerHostsDirectorsStorageVPLEX

FEPortVPLEX

FEPortVPLEX

FEPortVirtual

VolumeVirtual

VolumeVirtual

VolumeVPLEX

BE

PortVPLEX

BE

PortVPLEX

BE

PortStorage

VolumeStorage

VolumeStorage

VolumeManagement

ServerHostsDirectorsStorageVPLEX

FEPortVPLEX

FEPortVPLEX

FEPortWANFC/IPWANVPLEXArchitectureCopyright?HardwareComponentsEngineI/OModuleI/OCarrierDAEandSSDcardPowerSupplyFanManagementServerCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview22HardwareComponentsEngineCopyrVPLEXv4.0EngineOverviewScaleoutclusterarchitectureStartsmallandgrowbigwithpredictableservicelevelsAdvanceddatacachingImproveI/OperformanceandreducestoragearraycontentionDistributedcachecoherencyAutomaticbalancingandfailoverofstoragedomainswithinandacrossDataCentersFederatedinformationaccess“AccessAnywhere?”enablesgeographicdatadistributionCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview23VPLEXv4.0EngineOverviewScalVPLEXv4.0EngineCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview24FrontRearDirectorBDirectorAVPLEXv4.0EngineCopyright?2VPLEXv4.0I/OModulesCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview25Front-EndBack-EndGigEGigECOMCOMABVPLEXv4.0I/OModulesCopyrighVPLEXv4.0I/OModuleCarrierCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview26IOCarrierVPLEXv4.0I/OModuleCarrierCVPLEXv4.0I/OModuleTypes4port8GbpsFibreChannelI/OModuleUsedforFCCOMandFCWANconnectivitywithanI/OModulecarrierCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview27IOCarrierIOModuleVPLEXv4.0I/OModuleTypes4VPLEXv4.0ManagementandPowerModulesCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview28ManagementModulesPowerSuppliesVPLEXv4.0ManagementandPoweVPLEXv4.0SPSLEDsCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview29VPLEXv4.0SPSLEDsCopyright?VPLEXv4.0EngineFansFansaremonitoredthroughthepowersupplies.LabeledAtoDfromlefttoright.Lossofonefandoesnotimpactthesystem.Systemremainsonforthreeminutesiftwofansfail.Copyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview30VPLEXv4.0EngineFansFansareVPLEXV4.XConfigurationsataGlanceCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview31

SingleEngineDualEngineQuadEngineDirectors248RedundantEngineSPSsYesYesYesFEFibreChannelports163264BEFibreChannelports163264FCWANPorts4816Cache64GB128GB256GBManagementServers111FCswitches(ForLCOM)None22UPSNone22VPLEXV4.XConfigurationsataVPLEXProductandTechnologyDetailsCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview32VPLEX5.XArchitectureListanddefineVPLEX5.XhardwareandsoftwarearchitectureDescribeproductpackagingDefinehowVPLEX5.XmapsnativearrayvolumestoVPLEXvirtualvolumesVPLEXProductandTechnologyDVPLEXv5.0EngineCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview33FrontRearDirectorBDirectorAVPLEXv5.0EngineCopyright?VPLEXv5.0I/OModulesCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview34DirectorBDirectorAIOMB2

WANCOMIOMB3

LocalCOMIOMB0Front-endIOMB1Back-endIOMA2

WANCOMIOMA3

LocalCOMIOMA0Front-endIOMA1Back-endVPLEXv5.0I/OModulesCopyrighVPLEXv5.0I/OModuleTypesCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview

358Gb/sFibreChannel10Gb/sEthernetFillerModule(VPLEXLocal)VPLEXv5.0I/OModuleTypesCopVPLEXv5.0ManagementandPower/FanmodulesCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview36FrontRearDirectorAPS0PS1DirectorADirectorBDirectorBPS0PS1VPLEXv5.0ManagementandPoweVPLEXv5.0SPSLEDsCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview

37Amber=onbatterySteadyGreen=OnlineBlinkingGreen=ChargingVPLEXv5.0SPSLEDsCopyright?VPLEXV5.XConfigurationsataGlanceCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview38

SingleEngineDualEngineQuadEngineDirectors248RedundantEngineSPSsYesYesYesFEFibreChannelports81632BEFibreChannelports81632FCWANPorts8163210GbEWANPorts4816Cache72GB144GB288GBManagementServers111FCswitches(ForLCOM)None22UPSNone22VPLEXV5.XConfigurationsatVPLEXProductandTechnologyDetailsCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview39VPLEXManagementandPackagingListanddefineVPLEXmanagementhardwareDescribeproductpackagingVPLEXProductandTechnologyDVPLEXManagementServerCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview40VPLEXManagementServerCopyrigVPLEXManagementIPInfrastructureCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview41Management

ClientCustomer

LANInternal

IPLANInternal

IPLANVPLEXCLusterVPLEXManagementIPInfrastrucSwitchandManagementServerIPFormulasCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview42ManagementPortAttachedtoA-sidedaisychainManagementPortAttachedtoB-sidedaisychainObjectsFormulaManagementServerA-sidedaisychainManagementPort128.221.252.(ClusterNumber*32+1)B-sidedaisychainManagementPort128.221.253.(ClusterNumber*32+1)ServicePortCustomerNetworkPortUserAssignedFCSwitchesA-sideFCSwitch128.221.252.(ClusterNumber*32+2)B-sideFCSwitch128.221.253.(ClusterNumber*32+2)SwitchandManagementServerIVPLEXDirectorIPFormulaCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview43ObjectsFormulaDirectorA’sportattachedtoA-sidedaisychain128.221.252.(ClusterNumber*32+EngineNumber*2+1)DirectorA’sportattachedtoB-sidedaisychain128.221.253.(ClusterNumber*32+EngineNumber*2+1)DirectorB’sportattachedtoA-sidedaisychain128.221.252.(ClusterNumber*32+EngineNumber*2+2)DirectorB’sportattachedtoB-sidedaisychain128.221.253.(ClusterNumber*32+EngineNumber*2+2)DirectorADirectorBVPLEXDirectorIPFormulaCopyrVPLEXLocalIPLayoutCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview44ManagementServer

ManagementPortforB-sidenetwork: 3

ServicePort:

ManagementPortforA-sidenetwork: 3

PublicLANport: CustomerAssignedIPAddressFCSwitch1

IPAddress: 4Engine4,Cluster1

DirectorAIPAddresses:1,

1

DirectorBIPAddresses:2,2Engine3,Cluster1

DirectorAIPAddresses:9,9

DirectorBIPAddresses:0,0Engine2,Cluster1

DirectorAIPAddresses:7,7

DirectorBIPAddresses:8,8Engine1,Cluster1

DirectorAIPAddresses:5,5

DirectorBIPAddresses:6,6FCSwitch2

IPAddress: 4FC2FC1MSEngine1Engine2Engine3Engine4VPLEXLocalIPLayoutCopyrightFibreChannelCOMSwitchesConnectrixDS-300BCreatesredundantFibreChannelnetworkforCOMEachdirectorhastwoindependentCOMpathstoeveryotherdirectorRequiredonallVPLEXMediumandLargesystemsDualuse4portsperswitchQuaduse8portsperswitch16portsareunused/unlicensed(disabled)Copyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview45FibreChannelCOMSwitchesConnVPLEXSupportedConfigurationsCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview46SingleEngineQuadEngineDualEngineVPLEXSupportedConfigurationsVolumesRequiredforClusterOperationsMetadatavolumeRequiredtoholdVPLEXvolumeconfigurationswithinaclusterFront-endportscannotbeenabledwithoutthisvolumeCreationofametadatavolumesispartofinstallationMustbeatleast78GBRecommendedtobemirroredacrosstwoarraysFollowstatedbestpracticestobackupmetadatavolumeswhenrequiredLoggingvolume(VPLEXMetroonly)RequiredforcreatingdistributeddevicesKeepstrackofblockswrittenduringalossofconnectivitybetweenclusters10GBloggingcansupport320TBofdistributedstorageReceivesalotofI/OduringlinkoutagesShouldbefast(hostonFibreChanneldisks)Copyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview47VolumesRequiredforClusterOManagementServerUserAccountsLinuxshelladminPerformsadministrativeusermanagementactionsSCPfilesontothemanagementservertothedirectoriestheyhaveaccesstoModifythepublicEthernetsettingsserviceStartsandstopsnecessaryOSandVPLEXServicesVPLEXManagementConsole(CLIandGUI)adminAccesstothemanagementserverdesktop,VPlexcli,andManagementConsoleGUIAbilitytostartandstopmanagementserverservicesAccesstomostfilesonthefilesystemserviceAbilitytocreate,modify,anddeleteVPLEXuseraccountsAccesstomanagementserverdesktop,VPlexcli,andGUIAbilitytostartandstopmanagementserverservicesCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview48ManagementServerUserAccountVPLEXConstructsCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview49Initiator

PortVPLEX

FEPortVPLEX

FEPortInitiator

PortStorageViewVirtual

VolumeTop-Level

DeviceExtentExtentExtentDeviceDeviceStorageVolumeStorageVolumeStorageVolumeConsistencyGroupVPLEXConstructsCopyright?20VPLEXProductandTechnologyDetailsCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview50VPLEXI/OOperationsDescribethelifeofanI/OoperationwithinasingleclusterandVPLEXMetroDefinecachinglayers,rolesandinteractionswithinaVPLEXsystemDescribesysteminteractionduringreadsandwritesDemonstratepathandsystemcomponentredundancyVPLEXProductandTechnologyDCacheCoherencyCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview51CacheDirectoryDCacheDirectoryFCacheDirectoryHCacheDirectoryBCacheDirectoryCCacheDirectoryECacheDirectoryGCacheCacheCacheCacheEngineCacheCoherencyDirectoryBlockAddress12345678910111213…CacheACacheCCacheECacheGEngineCacheCoherencyDirectoryBlockAddress12345678910111213…CacheACacheCCacheECacheGCacheDirectoryANewWrite:Block3Read:Block3CacheCoherencyCopyright?201HowaReadisHandledLocalCacheHitDirectorsearchesitslocalcacheDataexistsandisdeliveredtohostfromlocalcacheGlobalCacheHitDirectorsearchesitslocalcacheDatadoesnotexist[localcachemiss]DirectorchecktheglobalcachecoherencetableDatadoesexistonadifferentdirector[Globalcachehit]DirectorreceivesanacknowledgementtellingitwhichdirectortoreadfromDirectorreadsfromthecacheofanotherdirectorCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview52HowaReadisHandledLocalCacI/OFlowofaLocalReadHitCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview53I/OFlowofaLocalReadHitCoI/OFlowofaGlobalReadHitCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview54I/OFlowofaGlobalReadHitCI/OFlowofaReadMissCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview55I/OFlowofaReadMissCopyrigHowaWriteisHandledOperationHostsendsawritetothedirectorDirectorcheckstheglobalcachecoherencetabletoensurethatanotherdirectordoesnothavealockonthelocationDirectoracquiresglobalcachecoherencelock(s)onblocksDirectornotifiestheotherdirectorswithintheclusteroftheglobalcachecoherencechangeDirectorwritesI/OtodiskDirectorsendsanacknowledgementtothehostProtectionEverywriteisacknowledgedbythearraybeforesendinganACKInVPLEXMetroeachlegisupdatedbeforesendinganACKCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview56HowaWriteisHandledOperatioI/OFlowofaWriteHitCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview57ACKI/OFlowofaWriteHitCopyrigI/OFlowofaWriteMissCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview58ACKI/OFlowofaWriteMissCopyriI/OFlowofaDistributedDevicesWriteCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview59SiteASiteBClusteredApplicationHostinDataCenterBwritesdatatosharedvolumeDataiswrittenthroughcachetobackendstorageDataisacknowledgedbyback-endarraysDataisacknowledgedtohostoncesafe10110…ACKACKMirroredVolume10110…10110…ACK10110…ACKFCI/OFlowofaDistributedDeviI/OFlowofRemoteAccessReadsandWritesCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview60SiteASiteBFCClusteredApplicationVirtualVolumesVirtualVolumesHostinDataCenterBwritesdatatovolume10110…10110…READREADHostinDataCenterAreadsdatafromvolume10110…10110…11001…HostinDataCenterAwritesdatatovolume11001…11001…I/OFlowofRemoteAccessReadPathRedundancyandFailureHandlingCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview61VirtualVolumeEngine1DirectorA1DirectorB1VirtualVolumeEngine1DirectorA1DirectorB1PathRedundancyandFailureHaPathRedundancyAcrossEnginesCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview62VirtualVolumeEngine1DirectorA1DirectorB1Engine2DirectorA2DirectorB2VirtualVolumeEngine1DirectorA1DirectorB1Engine2DirectorA2DirectorB2PathRedundancyAcrossEnginesVPLEXMetroPartitionandSiteFailuresConsideradistributedsystemwithtwositesFromSiteA’sperspectivethefollowingtwoconditionsareindistinguishableAddressingthisisfundamentaltothedesignofdistributedapplications.Copyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview63SiteASiteBSiteASiteBSiteASiteBPartitionFailureSiteFailureVPLEXMetroPartitionandSiteDetachRulestoDealwithFailureSituationsCluster-1-detachesReadsandwriteswillcontinueforthelegofthedistributeddeviceatcluster-1Loggingvolumewilltrackthechangestothelegatcluster-1Readsandwriteswillsuspendforthelegatcluster-2Cluster-2-detachesReadsandwriteswillcontinueforthelegofthedistributeddeviceatcluster-2Loggingvolumewilltrackthechangestothelegatcluster-2Readsandwriteswillsuspendforthelegatcluster-1ManualdetachBothlegsofadistributeddevicewillsuspendAdministratormustpickthewinningside/legAvailablewithVPLEXCLIonlyCopyright?2011EMCCorporation.AllRightsReserved.ProductandTechnologyOverview64VPlexcli:/distributed-storage/distributed-devices>llNameStatusOperationalHealthAutoRuleSetNameWOFTransferStatusStateResumeGroupSizeName

DS_1runningokoktruecluster-1-detaches-2