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Oracle Database 12c RAC损坏ocr和votedisk恢复实验

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Jun 07, 2016 pm 04:35 PM
databaseocroraclerac損壞

今天在Oracle 12c RAC下进行了破坏ocr和votedisk之后恢复的实验，基本和11g RAC相差无异，下面将实验过程分享一下。 实验环境：2-NODES Oracle Database 12c RAC on Linux6(OEL 6.4) 查看表决磁盘和Ocr相关信息 [root@12crac1 ~]# cd /u01/app/12.1.0/grid/b

今天在Oracle 12c RAC下进行了破坏ocr和votedisk之后恢复的实验，基本和11g RAC相差无异，下面将实验过程分享一下。

实验环境：2-NODES Oracle Database 12c RAC on Linux6(OEL 6.4)

查看表决磁盘和Ocr相关信息

[root@12crac1 ~]# cd /u01/app/12.1.0/grid/bin/
[root@12crac1 bin]# ./crsctl query css votedisk
##  STATE    File Universal Id                File Name Disk group
--  -----    -----------------                --------- ---------
 1. ONLINE   d883c23a7bfc4fdcbf418c9f631bd0af (/dev/asm-crs) [RACCRS]
Located 1 voting disk(s).
[root@12crac1 bin]# ./ocrcheck
Status of Oracle Cluster Registry is as follows :
         Version                  :          4
         Total space (kbytes)     :     409568
         Used space (kbytes)      :       1608
         Available space (kbytes) :     407960
         ID                       : 1658916461
         Device/File Name         :    +RACCRS
                                    Device/File integrity check succeeded
                                    Device/File not configured
                                    Device/File not configured
                                    Device/File not configured
                                    Device/File not configured
         Cluster registry integrity check succeeded


查看当前ocr备份情况

[root@12crac1 bin]# ./ocrconfig -showbackup
12crac1     2013/07/02 23:21:22     /u01/app/12.1.0/grid/cdata/scan12c/backup00.ocr
12crac1     2013/07/02 19:21:21     /u01/app/12.1.0/grid/cdata/scan12c/backup01.ocr
12crac1     2013/07/01 04:52:41     /u01/app/12.1.0/grid/cdata/scan12c/backup02.ocr
12crac1     2013/07/01 04:52:41     /u01/app/12.1.0/grid/cdata/scan12c/day.ocr
12crac1     2013/07/01 04:52:41     /u01/app/12.1.0/grid/cdata/scan12c/week.ocr
12crac1     2013/07/01 00:48:56     /u01/app/12.1.0/grid/cdata/scan12c/backup_20130701_004856.ocr
12crac1     2013/07/01 00:39:40     /u01/app/12.1.0/grid/cdata/scan12c/backup_20130701_003940.ocr

可以如下方式进行手工备份

[root@12crac1 bin]# ./ocrconfig -local -manualbackup
12crac1     2013/07/21 17:55:10     /u01/app/12.1.0/grid/cdata/12crac1/backup_20130721_175510.olr
12crac1     2013/07/01 00:39:39     /u01/app/12.1.0/grid/cdata/12crac1/backup_20130701_003939.olr

查看RAC资源服务状态

[grid@12crac1 ~]$ crsctl stat  res -t
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details       
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.LISTENER.lsnr
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.RACCRS.dg
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.RACDATA.dg
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.RACFRA.dg
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.asm
               ONLINE  ONLINE       12crac1                  Started,STABLE
               ONLINE  ONLINE       12crac2                  Started,STABLE
ora.net1.network
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.ons
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.12crac1.vip
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.12crac2.vip
      1        ONLINE  ONLINE       12crac2                  STABLE
ora.LISTENER_SCAN1.lsnr
      1        ONLINE  ONLINE       12crac2                  STABLE
ora.LISTENER_SCAN2.lsnr
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.LISTENER_SCAN3.lsnr
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.MGMTLSNR
      1        ONLINE  ONLINE       12crac1                  169.254.88.173 192.1
                                                             68.80.150,STABLE
ora.cvu
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.luocs12c.db
      1        ONLINE  ONLINE       12crac2                  Open,STABLE
      2        ONLINE  ONLINE       12crac1                  Open,STABLE
ora.mgmtdb
      1        ONLINE  ONLINE       12crac1                  Open,STABLE
ora.oc4j
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.scan1.vip
      1        ONLINE  ONLINE       12crac2                  STABLE
ora.scan2.vip
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.scan3.vip
      1        ONLINE  ONLINE       12crac1                  STABLE
--------------------------------------------------------------------------------

用ASMCMD的md_backup命令备份磁盘组，顺便查看该磁盘组里都存放什么。

[root@12crac2 ~]# su - grid
[grid@12crac2 ~]$ asmcmd -p
ASMCMD [+] > md_backup /home/grid/ocrvote.bak -G RACCRS
Disk group metadata to be backed up: RACCRS
Current alias directory path: scan12c
Current alias directory path: ASM
Current alias directory path: _MGMTDB/CONTROLFILE
Current alias directory path: _MGMTDB/TEMPFILE
Current alias directory path: ASM/PASSWORD
Current alias directory path: _MGMTDB/ONLINELOG
Current alias directory path: _MGMTDB
Current alias directory path: scan12c/OCRFILE
Current alias directory path: _MGMTDB/DATAFILE
Current alias directory path: scan12c/ASMPARAMETERFILE
Current alias directory path: _MGMTDB/PARAMETERFILE
-- 从这里可以看出,在Oracle 12c RAC中，存放ocr的磁盘组里多了不少文件，有_MGMTDB相关文件以及ASM的PASSWORD。
下面是11g RAC中存放OCR的磁盘组内容
ASMCMD [+] > md_backup /home/grid/ocrvote.bak -G hk_crs
Disk group metadata to be backed up: HK_CRS
Current alias directory path: racscan/OCRFILE
Current alias directory path: racscan
Current alias directory path: racscan/ASMPARAMETERFILE

也可以导出ocr的内容

[root@12crac1 bin]# ./ocrconfig -export /home/grid/ocr.bak

以下方式都无法删除当前使用的ocr内容

ASMCMD [+] > rm -rf /raccrs/scan12c/ocrfile
ORA-29261: bad argument
ORA-15178: directory 'ocrfile' is not empty; cannot drop this directory
ORA-15028: ASM file '+RACCRS.255.819592481' not dropped; currently being accessed
ORA-06512: at line 4 (DBD ERROR: OCIStmtExecute)
ASMCMD [+] > cd /raccrs/scan12c/ocrfile
ASMCMD [+raccrs/scan12c/ocrfile] > ls
REGISTRY.255.819592481
ASMCMD [+raccrs/scan12c/ocrfile] > rm -rf REGISTRY.255.819592481
ORA-15032: not all alterations performed
ORA-15028: ASM file '+raccrs/scan12c/ocrfile/REGISTRY.255.819592481' not dropped; currently being accessed (DBD ERROR: OCIStmtExecute)

那我们可以破坏存放ocr的设备文件

[root@12crac1 bin]# dd if=/dev/zero of=/dev/sdg bs=1024k count=1
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.00335689 s, 312 MB/s

然后停止集群：

[root@12crac1 bin]# ./crsctl stop has 
[root@12crac2 bin]# ./crsctl stop has -f

或crsctl stop crs [-f]也可以

尝试启动clusterware，发现clusterware无法正常启动

[root@12crac1 bin]# ./crsctl start has
CRS-4123: Oracle High Availability Services has been started.
[grid@12crac1 ~]$ crsctl check crs
CRS-4638: Oracle High Availability Services is online
CRS-4535: Cannot communicate with Cluster Ready Services
CRS-4530: Communications failure contacting Cluster Synchronization Services daemon
CRS-4534: Cannot communicate with Event Manager

查看集群日志：

2013-07-20 23:46:01.413: 
[ohasd(18692)]CRS-0714:Oracle Clusterware Release 12.1.0.1.0 - Production Copyright 1996, 2010 Oracle. All rights reserved.
2013-07-20 23:46:01.451: 
[ohasd(18692)]CRS-2112:The OLR service started on node 12crac1.
2013-07-20 23:46:01.494: 
[ohasd(18692)]CRS-1301:Oracle High Availability Service started on node 12crac1.
2013-07-20 23:46:01.498: 
[ohasd(18692)]CRS-8017:location: /etc/oracle/lastgasp has 2 reboot advisory log files, 0 were announced and 0 errors occurred
2013-07-20 23:46:10.768: 
[gpnpd(19041)]CRS-2328:GPNPD started on node 12crac1. 
2013-07-20 23:46:42.712: 
[cssd(19212)]CRS-1713:CSSD daemon is started in hub mode
2013-07-20 23:46:43.221: 
[cssd(19212)]CRS-1714:Unable to discover any voting files, retrying discovery in 15 seconds; Details at (:CSSNM00070:) in /u01/app/12.1.0/grid/log/12crac1/cssd/ocssd.log
2013-07-20 23:46:44.142: 
[ohasd(18692)]CRS-2767:Resource state recovery not attempted for 'ora.diskmon' as its target state is OFFLINE
2013-07-20 23:46:44.143: 
[ohasd(18692)]CRS-2769:Unable to failover resource 'ora.diskmon'.
2013-07-20 23:46:58.280: 
[cssd(19212)]CRS-1714:Unable to discover any voting files, retrying discovery in 15 seconds; Details at (:CSSNM00070:) in /u01/app/12.1.0/grid/log/12crac1/cssd/ocssd.log

查看/u01/app/12.1.0/grid/log/12crac1/cssd/ocssd.log日志

2013-07-20 23:48:13.450: [    GPNP][1105622784]clsgpnp_profileCallUrlInt: [at clsgpnp.c:2207] get-profile call to url "ipc://GPNPD_12crac1" disco "" [f=0 claimed- host: cname: cguid: cli:gpnp p:19212 role: seq: ep: auth: diag:[]] 
2013-07-20 23:48:13.476: [    GPNP][1105622784]clsgpnp_profileCallUrlInt: [at clsgpnp.c:2360] Result: (0) CLSGPNP_OK. Successful get-profile CALL to remote "ipc://GPNPD_12crac1" disco ""
2013-07-20 23:48:13.477: [    CSSD][1105622784]clssnmReadDiscoveryProfile: voting file discovery string(/dev/asm*)
2013-07-20 23:48:13.478: [    CSSD][1105622784]clssnmvDDiscThread: using discovery string /dev/asm* for initial discovery 
2013-07-20 23:48:13.478: [   SKGFD][1105622784]Discovery with str:/dev/asm*:
2013-07-20 23:48:13.478: [   SKGFD][1105622784]UFS discovery with :/dev/asm*:
2013-07-20 23:48:13.491: [   SKGFD][1105622784]Fetching UFS disk :/dev/asm-data:
2013-07-20 23:48:13.491: [   SKGFD][1105622784]Fetching UFS disk :/dev/asm-fra:
2013-07-20 23:48:13.492: [   SKGFD][1105622784]Fetching UFS disk :/dev/asm-crs:
2013-07-20 23:48:13.492: [   SKGFD][1105622784]Fetching UFS disk :/dev/asm-extcrs:
2013-07-20 23:48:13.492: [   SKGFD][1105622784]Fetching UFS disk :/dev/asm:
2013-07-20 23:48:13.492: [   SKGFD][1105622784]OSS discovery with :/dev/asm*:
2013-07-20 23:48:13.495: [   SKGFD][1105622784]Handle 0x7f8c10170500 from lib :UFS:: for disk :/dev/asm-data:
2013-07-20 23:48:13.498: [   SKGFD][1105622784]Handle 0x7f8c1016e8a0 from lib :UFS:: for disk :/dev/asm-fra:
2013-07-20 23:48:13.500: [   SKGFD][1105622784]Handle 0x7f8c1016f0d0 from lib :UFS:: for disk :/dev/asm-crs:
2013-07-20 23:48:13.501: [   SKGFD][1105622784]Handle 0x7f8c1011c4e0 from lib :UFS:: for disk :/dev/asm-extcrs:
2013-07-20 23:48:13.501: [   SKGFD][1105622784]Lib :UFS:: closing handle 0x7f8c10170500 for disk :/dev/asm-data:
2013-07-20 23:48:13.501: [   SKGFD][1105622784]Lib :UFS:: closing handle 0x7f8c1016e8a0 for disk :/dev/asm-fra:
2013-07-20 23:48:13.501: [   SKGFD][1105622784]Lib :UFS:: closing handle 0x7f8c1016f0d0 for disk :/dev/asm-crs:
2013-07-20 23:48:13.502: [   SKGFD][1105622784]Lib :UFS:: closing handle 0x7f8c1011c4e0 for disk :/dev/asm-extcrs:
2013-07-20 23:48:13.503: [    CSSD][1105622784]clssnmvDiskVerify: Successful discovery of 0 disks
2013-07-20 23:48:13.503: [    CSSD][1105622784]clssnmCompleteInitVFDiscovery: Completing initial voting file discovery
2013-07-20 23:48:13.503: [    CSSD][1105622784]clssnmvFindInitialConfigs: No voting files found
2013-07-20 23:48:13.503: [    CSSD][1105622784](:CSSNM00070:)clssnmCompleteInitVFDiscovery: Voting file not found. Retrying discovery in 15 seconds

– 我们可以看出表决磁盘无法找到等报错信息。

下面将集群关闭，尝试恢复。

[root@12crac1 bin]# ./crsctl stop has -f

ocr和vote disk损坏恢复步骤大致如下：

1）停止所有节点clusterware
# crsctl stop crs
# crsctl stop crs -f
2）以root用户在其中一个节点度扎模式启动clusterware
# crsctl start crs -excl -nocrs
备注：如果发现crsd在运行，那么通过如下命令将之停止。
# crsctl stop resource ora.crsd -init
3）创建新的存放ocr和vote disk的磁盘组，磁盘组名和原有的一致(如果想改变位置，需修改/etc/oracle/ocr.loc文件)
备注：如发现无法创建等情况，可以采用如下删除磁盘组等排错思路
SQL> drop diskgroup disk_group_name force including contents;
4）还原ocr，并检查
# ocrconfig -restore file_name
# ocrcheck
5）恢复表决磁盘，并检查
# crsctl replace votedisk +asm_disk_group
# crsctl query css votedisk
6）停止独占模式运行的clusterware
# crsctl stop crs -f
7）所有节点正常启动clusterware
# crsctl start crs
8）CVU验证所有RAC节点OCR的完整性
$ cluvfy comp ocr -n all -verbose

下面开始演示操作，独占模式运行clusterware
[root@12crac1 bin]# ./crsctl start crs -excl -nocrs
CRS-4123: Oracle High Availability Services has been started.
CRS-2673: Attempting to stop 'ora.drivers.acfs' on '12crac2'
CRS-2677: Stop of 'ora.drivers.acfs' on '12crac2' succeeded
CRS-2672: Attempting to start 'ora.evmd' on '12crac2'
CRS-2672: Attempting to start 'ora.mdnsd' on '12crac2'
CRS-2676: Start of 'ora.evmd' on '12crac2' succeeded
CRS-2676: Start of 'ora.mdnsd' on '12crac2' succeeded
CRS-2672: Attempting to start 'ora.gpnpd' on '12crac2'
CRS-2676: Start of 'ora.gpnpd' on '12crac2' succeeded
CRS-2672: Attempting to start 'ora.cssdmonitor' on '12crac2'
CRS-2672: Attempting to start 'ora.gipcd' on '12crac2'
CRS-2676: Start of 'ora.cssdmonitor' on '12crac2' succeeded
CRS-2676: Start of 'ora.gipcd' on '12crac2' succeeded
CRS-2672: Attempting to start 'ora.cssd' on '12crac2'
CRS-2672: Attempting to start 'ora.diskmon' on '12crac2'
CRS-2676: Start of 'ora.diskmon' on '12crac2' succeeded
CRS-2676: Start of 'ora.cssd' on '12crac2' succeeded
CRS-2672: Attempting to start 'ora.drivers.acfs' on '12crac2'
CRS-2672: Attempting to start 'ora.cluster_interconnect.haip' on '12crac2'
CRS-2672: Attempting to start 'ora.ctssd' on '12crac2'
CRS-2676: Start of 'ora.drivers.acfs' on '12crac2' succeeded
CRS-2676: Start of 'ora.ctssd' on '12crac2' succeeded
CRS-2676: Start of 'ora.cluster_interconnect.haip' on '12crac2' succeeded
CRS-2672: Attempting to start 'ora.asm' on '12crac2'
CRS-2676: Start of 'ora.asm' on '12crac2' succeeded
通过grid用户登录sqlplus创建ASM磁盘组
[grid@12crac2 ~]$ sqlplus / as sysasm
SQL*Plus: Release 12.1.0.1.0 Production on Sun Jul 21 00:11:46 2013
Copyright (c) 1982, 2013, Oracle.  All rights reserved.
Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options
SQL> create diskgroup raccrs external redundancy disk '/dev/asm-extcrs' attribute 'compatible.asm' = '12.1.0.0.0';
Diskgroup created.
通过ocrconfig还原Ocr
[root@12crac1 bin]# ./ocrconfig -import /home/grid/ocr.bak 
或者
[root@12crac1 bin]# ./ocrconfig -restore /u01/app/12.1.0/grid/cdata/scan12c/backup00.ocr
查看表决磁盘信息，当前无法找到
[root@12crac1 bin]# ./crsctl query css votedisk
Located 0 voting disk(s).
恢复表决磁盘，可能会遇到如下问题
[root@12crac1 bin]# ./crsctl replace votedisk +RACCRS
CRS-4602: Failed 27 to add voting file 3782393479bf4f07bf313dc5a8f4c58a.
Failed to replace voting disk group with +RACCRS.
CRS-4000: Command Replace failed, or completed with errors.
此问题需要重新配置一下ASM的参数并重启ASM来解决。
[grid@12crac1 ~]$ sqlplus / as sysasm
SQL*Plus: Release 12.1.0.1.0 Production on Sun Jul 21 00:40:01 2013
Copyright (c) 1982, 2013, Oracle.  All rights reserved.
Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options
SQL> alter system set asm_diskstring='/dev/asm*';
System altered.
SQL> create spfile from memory;
File created.
SQL> startup force mount;
ORA-32004: obsolete or deprecated parameter(s) specified for ASM instance
ASM instance started
Total System Global Area 1135747072 bytes
Fixed Size                  2297344 bytes
Variable Size            1108283904 bytes
ASM Cache                  25165824 bytes
ASM diskgroups mounted
ASM diskgroups volume enabled
重新恢复表决磁盘
[root@12crac1 bin]# ./crsctl replace votedisk +RACCRS
Successful addition of voting disk 1499cddff03a4f86bf01599718febcb1.
Successfully replaced voting disk group with +RACCRS.
CRS-4266: Voting file(s) successfully replaced
[root@12crac1 bin]# ./crsctl query css votedisk
##  STATE    File Universal Id                File Name Disk group
--  -----    -----------------                --------- ---------
 1. ONLINE   1499cddff03a4f86bf01599718febcb1 (/dev/asm-extcrs) [RACCRS]
Located 1 voting disk(s).
退出独占模式：
[root@12crac1 bin]# ./crsctl stop crs -f
CRS-2791: Starting shutdown of Oracle High Availability Services-managed resources on '12crac1'
CRS-2673: Attempting to stop 'ora.ctssd' on '12crac1'
CRS-2673: Attempting to stop 'ora.mdnsd' on '12crac1'
CRS-2673: Attempting to stop 'ora.drivers.acfs' on '12crac1'
CRS-2673: Attempting to stop 'ora.gpnpd' on '12crac1'
CRS-2677: Stop of 'ora.drivers.acfs' on '12crac1' succeeded
CRS-2677: Stop of 'ora.mdnsd' on '12crac1' succeeded
CRS-2677: Stop of 'ora.gpnpd' on '12crac1' succeeded
CRS-2677: Stop of 'ora.ctssd' on '12crac1' succeeded
CRS-2673: Attempting to stop 'ora.evmd' on '12crac1'
CRS-2673: Attempting to stop 'ora.asm' on '12crac1'
CRS-2677: Stop of 'ora.evmd' on '12crac1' succeeded
CRS-2677: Stop of 'ora.asm' on '12crac1' succeeded
CRS-2673: Attempting to stop 'ora.cluster_interconnect.haip' on '12crac1'
CRS-2677: Stop of 'ora.cluster_interconnect.haip' on '12crac1' succeeded
CRS-2673: Attempting to stop 'ora.cssd' on '12crac1'
CRS-2677: Stop of 'ora.cssd' on '12crac1' succeeded
CRS-2673: Attempting to stop 'ora.gipcd' on '12crac1'
CRS-2677: Stop of 'ora.gipcd' on '12crac1' succeeded
CRS-2793: Shutdown of Oracle High Availability Services-managed resources on '12crac1' has completed
CRS-4133: Oracle High Availability Services has been stopped.
所有节点都正常启动：
[root@12crac1 bin]# ./crsctl start has
CRS-4123: Oracle High Availability Services has been started.
[root@12crac2 bin]# ./crsctl start has
CRS-4123: Oracle High Availability Services has been started.
查看clusterware运行状态
[grid@12crac1 ~]$ crsctl check crs
CRS-4638: Oracle High Availability Services is online
CRS-4537: Cluster Ready Services is online
CRS-4529: Cluster Synchronization Services is online
CRS-4533: Event Manager is online
[grid@12crac2 ~]$ crsctl check crs
CRS-4638: Oracle High Availability Services is online
CRS-4537: Cluster Ready Services is online
CRS-4529: Cluster Synchronization Services is online
CRS-4533: Event Manager is online
查看所有资源状态
[grid@12crac1 ~]$ crsctl stat  res -t
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details       
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.LISTENER.lsnr
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.RACCRS.dg
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.RACDATA.dg
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.RACFRA.dg
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.asm
               ONLINE  ONLINE       12crac1                  Started,STABLE
               ONLINE  ONLINE       12crac2                  Started,STABLE
ora.net1.network
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.ons
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.12crac1.vip
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.12crac2.vip
      1        ONLINE  ONLINE       12crac2                  STABLE
ora.LISTENER_SCAN1.lsnr
      1        ONLINE  ONLINE       12crac2                  STABLE
ora.LISTENER_SCAN2.lsnr
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.LISTENER_SCAN3.lsnr
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.MGMTLSNR
      1        ONLINE  ONLINE       12crac2                  169.254.171.71 192.1
                                                             68.80.154,STABLE
ora.cvu
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.luocs12c.db
      1        ONLINE  ONLINE       12crac2                  Open,STABLE
      2        ONLINE  ONLINE       12crac1                  Open,STABLE
ora.mgmtdb
      1        ONLINE  OFFLINE                               Instance Shutdown,ST
                                                             ABLE
ora.oc4j
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.scan1.vip
      1        ONLINE  ONLINE       12crac2                  STABLE
ora.scan2.vip
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.scan3.vip
      1        ONLINE  ONLINE       12crac1                  STABLE
--------------------------------------------------------------------------------

在这里我们会发现mgmtdb没有正常启动，手动尝试启动，会遇到问题。

[grid@12crac1 ~]$ srvctl start mgmtdb 
PRCR-1079 : Failed to start resource ora.mgmtdb
CRS-5017: The resource action "ora.mgmtdb start" encountered the following error: 
ORA-01078: failure in processing system parameters
LRM-00109: could not open parameter file '/u01/app/12.1.0/grid/dbs/init-MGMTDB.ora'
. For details refer to "(:CLSN00107:)" in "/u01/app/12.1.0/grid/log/12crac2/agent/crsd/oraagent_grid/oraagent_grid.log".
CRS-2674: Start of 'ora.mgmtdb' on '12crac2' failed
CRS-5017: The resource action "ora.mgmtdb start" encountered the following error: 
ORA-01078: failure in processing system parameters
ORA-01565: error in identifying file '+RACCRS/_mgmtdb/spfile-MGMTDB.ora'
ORA-17503: ksfdopn:2 Failed to open file +RACCRS/_mgmtdb/spfile-MGMTDB.ora
ORA-15056: additional error message
ORA-17503: ksfdopn:2 Failed to open file +RACCRS/_mgmtdb/spfile-mgmtdb.ora
ORA-15173: entry '_mgmtdb' does not exist in directory '/'
ORA-06512: at line 4
. For details refer to "(:CLSN00107:)" in "/u01/app/12.1.0/grid/log/12crac1/agent/crsd/oraagent_grid/oraagent_grid.log".
CRS-2674: Start of 'ora.mgmtdb' on '12crac1' failed
CRS-2632: There are no more servers to try to place resource 'ora.mgmtdb' on that would satisfy its placement policy

– 此问题造成原因是，我们dd了存放ocr的ASM磁盘组之后，里面的_MGMTDB相关文件也都将损坏丢失。从报错信息可见无法找到参数文件。

查看mgmtdb配置信息

[grid@12crac1 ~]$ srvctl config mgmtdb -all -verbose
Database unique name: _mgmtdb
Database name: 
Oracle home: /u01/app/12.1.0/grid
Oracle user: grid
Spfile: +RACCRS/_mgmtdb/spfile-MGMTDB.ora
Password file: 
Domain: 
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Database instance: -MGMTDB
Type: Management
Database is enabled

目前还不知如何修复mgmtdb的方法，因此我remove了下

[grid@12crac1 ~]$ srvctl remove mgmtdb
Remove the database _mgmtdb? (y/[n]) y
[grid@12crac1 ~]$ crsctl stat res -t
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details       
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.LISTENER.lsnr
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.RACCRS.dg
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.RACDATA.dg
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.RACFRA.dg
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.asm
               ONLINE  ONLINE       12crac1                  Started,STABLE
               ONLINE  ONLINE       12crac2                  Started,STABLE
ora.net1.network
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
ora.ons
               ONLINE  ONLINE       12crac1                  STABLE
               ONLINE  ONLINE       12crac2                  STABLE
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.12crac1.vip
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.12crac2.vip
      1        ONLINE  ONLINE       12crac2                  STABLE
ora.LISTENER_SCAN1.lsnr
      1        ONLINE  ONLINE       12crac2                  STABLE
ora.LISTENER_SCAN2.lsnr
      1        ONLINE  ONLINE       12crac2                  STABLE
ora.LISTENER_SCAN3.lsnr
      1        ONLINE  ONLINE       12crac2                  STABLE
ora.MGMTLSNR
      1        ONLINE  ONLINE       12crac2                  169.254.171.71 192.1
                                                             68.80.154,STABLE
ora.cvu
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.luocs12c.db
      1        ONLINE  ONLINE       12crac2                  Open,STABLE
      2        ONLINE  ONLINE       12crac1                  Open,STABLE
ora.oc4j
      1        ONLINE  ONLINE       12crac1                  STABLE
ora.scan1.vip
      1        ONLINE  ONLINE       12crac2                  STABLE
ora.scan2.vip
      1        ONLINE  ONLINE       12crac2                  STABLE
ora.scan3.vip
      1        ONLINE  ONLINE       12crac2                  STABLE
--------------------------------------------------------------------------------

mgmtdb备份还原以及修复等方法，有待研究，本次实验先到这里。

原文地址：Oracle Database 12c RAC损坏ocr和votedisk恢复实验, 感谢原作者分享。

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