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对Oracle数据库进行容灾

 2008-12-16 13:02:33 来源:WEB开发网   
核心提示: 可以手工进行gracefully切换root@lxsfrac01#umount/oracleroot@lxsfrac01#vradmin-goradgmigrateora_rvglxsfrac02-privVxVMVVRvradminWARNINGV-5-52-93Makesureappl

可以手工进行gracefully切换

root@lxsfrac01#umount/oracle
  root@lxsfrac01#vradmin-goradgmigrateora_rvglxsfrac02-priv
  VxVMVVRvradminWARNINGV-5-52-93MakesureapplicationsusingPrimarydatavolumesarestopped.
  vradmin:Continuewithmigrate(y/n)?y
  root@lxsfrac01#

下面我们就在上面搭建好的VVR环境中对容灾数据进行切换测试:

注:在下面测试中,主节点为lxsfrac02,备用节点为lxsfrac01 

 ======================================显示主备节点状态=================================
  root@lxsfrac02#vradmin-goradg-lrepstatusora_rvg
  ReplicatedDataSet:ora_rvg
  Primary:
  Hostname:lxsfrac02-priv
  RVGname:ora_rvg
  DGname:oradg
  RVGstate:enabledforI/O
  Datavolumes:1
  VSets:0
  SRLname:srl
  SRLsize:800.00M
  Totalsecondaries:1
  Secondary:
  Hostname:lxsfrac01-priv
  RVGname:ora_rvg
  DGname:oradg
  RlinkfromPrimary:rlk_lxsfrac01-priv_ora_rvg
  RlinktoPrimary:rlk_lxsfrac02-priv_ora_rvg
  Configuredmode:asynchronous
  Latencyprotection:off
  SRLprotection:autodcm
  Datastatus:inconsistent
  Replicationstatus:resyncinprogress(autosync)
  Currentmode:asynchronous
  Loggingto:DCM(contains5181696Kbytes)(autosync)
  TimestampInformation:N/A
  BandwidthLimit:N/A
  ====================================显示replicationlink状态=================================
  root@lxsfrac02#vxrlink-goradgstatusrlk_lxsfrac01-priv_ora_rvg
  MonNov0516:52:512007
  VxVMVVRvxrlinkINFOV-5-1-4467Rlinkrlk_lxsfrac01-priv_ora_rvgisuptodate
  ====================================在主节点插入试验数据16:55================================
  oracle@lxsfrac02$sysdba
  SQL*Plus:Release10.2.0.1.0-ProductiononMonNov516:55:122007
  Copyright(c)1982,2005,Oracle.Allrightsreserved.
  Connectedto:
  OracleDatabase10gEnterpriseEditionRelease10.2.0.1.0-Production
  WiththePartitioning,OLAPandDataMiningoptions
  SQL>createtabletest(avarchar(20))tablespaceusers;
  Tablecreated.
  SQL>insertintotestvalues('1');
  1rowcreated.
  SQL>commit;
  Commitcomplete.
  SQL>insertintotestvalues('2');
  1rowcreated.
  SQL>
  SQL>
  SQL>commit;
  Commitcomplete.
  ======================================立即异常关闭oracle和操作系统============================
  root@lxsfrac02#ps-ef|egrep"ora_|asm_"|grep-vgrep|grep-vcrs|awk'{print$2}'|xargskill-9
  root@lxsfrac02#
  root@lxsfrac02#ps-ef|grepora
  root19301016:08:13?0:02/opt/VRTSobc/pal33/bin/vxpal-aStorageAgent-x
  oracle1942019419016:55:12?0:00oracleracg1(DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
  oracle1941419410016:55:11pts/30:00-bash
  oracle1941919414016:55:12pts/30:00sqlplus/assysdba
  root198723725016:56:49pts/20:00grepora
  root@lxsfrac02#
  root@lxsfrac02#poweroff
  从系统日志/var/tmp/messages可以查看到相关信息:
  Nov516:57:26lxsfrac02poweroff:[ID662345auth.crit]poweroffedbyroot
  =======================================在备用节点进行接管=======================================
  root@lxsfrac01#vradmin-goradgmigrateora_rvglxsfrac01-priv
  VxVMVVRvradminWARNINGV-5-52-93MakesureapplicationsusingPrimarydatavolumesarestopped.
  vradmin:Continuewithmigrate(y/n)?y
  MessagefromHostlxsfrac01-priv:
  VxVMVVRvradminERRORV-5-52-449Secondaryora_rvgdoesnothaveanactivePrimary.
  root@lxsfrac01#
  root@lxsfrac01#vradmin-goradgtakeoverora_rvg
  root@lxsfrac01#date
  MonNov517:05:13CST2007
  root@lxsfrac01#vxprint-htqgoradg
  dgoradgdefaultdefault100001193985774.38.lxsfrac01
  dmAMS_WMS0_2AMS_WMS0_2auto655364116224-
  dmAMS_WMS0_3AMS_WMS0_3auto65536146687968-
  rvora_rvg1ENABLEDACTIVEprimary1srl
  rlrlk_lxsfrac02-priv_ora_rvgora_rvgENABLEDACTIVElxsfrac02-privoradgrlk_lxsfrac01-priv_ora_rvg
  voravolora_rvgENABLEDACTIVE20971520SELECT-fsgen
  ploravol-01oravolENABLEDACTIVE20971520CONCAT-RW
  sdAMS_WMS0_3-01oravol-01AMS_WMS0_30209715200AMS_WMS0_3ENA
  ploravol-02oravolENABLEDACTIVELOGONLYCONCAT-RW
  sdAMS_WMS0_2-01oravol-02AMS_WMS0_20352LOGAMS_WMS0_2ENA
  ploravol-03oravolENABLEDACTIVELOGONLYCONCAT-RW
  sdAMS_WMS0_3-03oravol-03AMS_WMS0_322609920352LOGAMS_WMS0_3ENA
  vsrlora_rvgENABLEDACTIVE1638400SELECT-SRL
  plsrl-01srlENABLEDACTIVE1638400CONCAT-RW
  sdAMS_WMS0_3-02srl-01AMS_WMS0_32097152016384000AMS_WMS0_3ENA
  root@lxsfrac01#
  ================================启动备用节点Oracle数据库,并检查数据完整========================
  root@lxsfrac01#mount-Fvxfs/dev/vx/dsk/oradg/oravol/oracle
  root@lxsfrac01#
  root@lxsfrac01#su-oracle
  SunMicrosystemsInc.SunOS5.10GenericJanuary2005
  oracle@lxsfrac01$sysdba
  SQL*Plus:Release10.2.0.1.0-ProductiononMonNov517:05:372007
  Copyright(c)1982,2005,Oracle.Allrightsreserved.
  Connectedtoanidleinstance.
  SQL>startup
  ORACLEinstancestarted.
  TotalSystemGlobalArea2147483648bytes
  FixedSize2120448bytes
  VariableSize496870656bytes
  DatabaseBuffers1644167168bytes
  RedoBuffers4325376bytes
  Databasemounted.
  Databaseopened.
  SQL>select*fromtest;
  A
  --------------------
  1
  2

================================ 显示数据正常 ===========================

在第二个节点vxdg import oradg

然后recover

直到两个节点vxprint -htqg oradg都正常:ENABLED/ACTIVE

3.错误V-5-1-434,我遇到了两次,一次是在createpri,一次在addsec,原因是主备的DCM默认都需要mirror,所以所在的磁盘组都最少包括两块磁盘(或LUN),通过vxdg -g oradg adddisk another_disk解决。 

root@lxsfrac01 # vradmin -g oradg createpri ora_rvg >system,sysaux,temp,users,example,ctlfile1,ctlfile2,ctlfile3,redo101,redo102,redo103,undo11,spfile
>srl
  MessagefromPrimary:
  VxVMvxassistERRORV-5-1-434Cannotallocatespacefor32blocklog
  root@lxsfrac01#vradmin-goradgaddsecora_rvglxsfrac01-privlxsfrac02-priv
  MessagefromHostlxsfrac02-priv:
  VxVMvxassistERRORV-5-1-434Cannotallocatespacefor352blocklog

4.检查vvr后台进程  

root@lxsfrac02#ps-ef|grepvrad|grep-vgrep
  root98081016:24:47?0:00/usr/sbin/vradmind

如果进程状态不对,使用下面语句来手工启动:

 /etc/init.d/vras-vradmind.shstart

可以看到vradmin是随系统自启动的: 

 root@lxsfrac02#find/etc/rc*-name'*vr*'-print
  /etc/rc0.d/K01vras-vradmind
  /etc/rc1.d/K01vras-vradmind
  /etc/rc2.d/S96vradmind
  /etc/rcS.d/K01vras-vradmind

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