资料课件讲义GAD技术GAD IO原理

MDKC/RDKC主备存储都能接受主机的读/写的I/O，其中读是本地读。GAD需要主备存储都是VSPG1000GADP/S-VOL必须是POOL-VOLQuorumDKC仲裁盘在灾难时候判定GAD主/备角色可用性只有VSPG1000虚拟化兼容的存储都可以做仲裁存储ProductionServers支持应用集群、数据库集群GAD的主/备是双活的,GAD目前没有一致性组，但后续版本将会有一致性组,Global-ActiveDevice-CrossLink,Global-ActiveDevice-NoCrossLink,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,OSServerClusterorOracleRAC,Note:VMwareandMicrosoftHyper-Vcannotachievenon-disruptiveserverfailoverandwillrequiretheVMstobere-startedifaccesstostoragefails.,MDKC/RDKC主备存储都能接受主机的读/写的I/O，其中读是本地读。GAD需要主备存储都是VSPG1000GADP/S-VOL必须是POOL-VOLQuorumDKC仲裁盘在灾难时候判定GAD主/备角色可用性只有VSPG1000虚拟化兼容的存储都可以做仲裁存储ProductionServers操作系统集群、OracleRACGAD的主/备是双活的,GAD目前没有一致性组，但后续版本将会有一致性组,VirtualDKC,VirtualDKC,PhysicalDKC(Suez),PhysicalDKC(Suez),MDKC,RDKC,PhysicalDKC(Suez),PhysicalDKC(Suez),无论从主/备主机下来的写I/O，都要写到P和S存储后才完成。任何情况下，主机端的写I/O一定先写P存储，再写S存储GAD环境，主机端不必须要求使用HDLM，只要VSPG1000兼容的多路径即可。,WriteI/O,ReadI/O,支持本地读机制但如果本地存储故障，远程存储会接管读I/O的控制GAD环境，主机端不必须要求使用HDLM，只要VSPG1000兼容的多路径即可。,WriteI/O,WriteI/O,ReadI/O,ReadI/O,GADActive-ActivewithRead-Local,MDKC,RDKC,GADWriteI/OFlowtoMDKC,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,App/DBMSclustering,1.WriteI/O,GADWriteI/OFlowtoMDKC,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,App/DBMSclustering,2.Setexclusivelock,GADWriteI/OFlowtoMDKC,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,App/DBMSclustering,3.WritetoMDKC,GADWriteI/OFlowtoMDKC,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,App/DBMSclustering,4.WritetoRDKC,GADWriteI/OFlowtoMDKC,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,App/DBMSclustering,5.Releaseexclusivelock,GADWriteI/OFlowtoMDKC,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,App/DBMSclustering,6.Returngood,GADWriteI/OFlowtoRDKC,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,App/DBMSclustering,1.WriteI/O,GADWriteI/OFlowtoRDKC,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,App/DBMSclustering,2.Setexclusivelock,GADWriteI/OFlowtoRDKC,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,App/DBMSclustering,3.WritetoMDKC,GADWriteI/OFlowtoRDKC,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,App/DBMSclustering,4.WritetoRDKC,GADWriteI/OFlowtoRDKC,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,App/DBMSclustering,5.Returngood,GADWriteI/OFlowtoRDKC,MDKC,RDKC,HAmirroring,QRM,QuorumDKC,Prod.Server-1(Active),Prod.Server-2(Active),App/DBMS,App/DBMS,App/DBMSclustering,6.Releaseexclusivelock,无论I/O从MDKC还是RDKC写入，GAD总是先写到MDKC，再同步到RDKC；锁的动作由MDKC的MPB控制，并且锁的动作不需要quorum。,Global-ActiveDeviceDescription,VSPG1000GAD和VSPHAM差异,VSPG1000S/N12345,Volumes,VSPG1000S/N23456,Volumes,VSPG1000S/N12345,100km(62ml.),Prod.Servers,VSPS/N45678,Volumes(Active),VSPS/N56789,Volumes(Standby),30km(18ml.),Prod.Servers,VSPG1000global-activedevice,VSPHAM,(*1)CombinationwithotherreplicationPP.(*2)TargetsupportmicrocodeversionmayvaryperPP.,SystemConfiguration-PlanningDataCenters-,3数据中心存储分别放在3个数据中心任一数据中心故障、存储故障都能提供最高等级的业务连续性支持存储级、数据中心级双活解决方案,PrimaryStorageSystem,SecondaryStorageSystem,QRM,Quorum,QRM,Quorum,Localsite,Remotesite,Quorumsite,QRM,Localsite,Remotesite,Localsite,2数据中心主存储和仲裁存储放生产中心备份存储放备份中心.任一存储故障、或者备份中心故障能够提供高等级的业务连续性支持存储级双活解决方案,单数据中心所有存储都放单数据中心任一存储故障能够提供高等级的业务连续性支持存储级双活解决方案,Quorum,PrimaryStorageSystem,SecondaryStorageSystem,PrimaryStorageSystem,SecondaryStorageSystem,QRM,QRM,SystemConfiguration-SiteConfigurationandFailureTolerance-,QRM,QRM,WhenfailingtocommunicatewithPrimaryStorageSystem,SecondaryStorageSystemtakesSVOLlockonthequorumdisk.,WhenfailingtocommunicatewithSecondaryStorageSystem,PrimaryStorageSystemtakesPVOLlockonthequorumdisk.,WhenfailingtocommunicatewithQuorum,PrimaryStorageSystemchangestheSVOLtoblockage.,QRM,Duetothefailureofquorumdisk,theSecondaryStorageSystemcannottaketheSVOLlock,causingI