使用导出导入进行OCR的备份和恢复：
在对集群做调整前，如：增删节点等操作前，应该对OCR进行一次备份，可以使用export备份到指定文件。
实验环境：
OS：OEL5.6
RAC：10.2.0.1.0
(1)关闭所有节点的CRS
节点1：
[root@rac1 crsd]# crsctl stop crs
Stopping resources.
Successfully stopped CRS resources
Stopping CSSD.
Shutting down CSS daemon.
Shutdown request successfully issued.
节点2：
[root@rac2 ~]# crsctl stop crs
Stopping resources.
Successfully stopped CRS resources
Stopping CSSD.
Shutting down CSS daemon.
Shutdown request successfully issued.
（2）导出OCR的内容。
[root@rac1 crsd]# cd
[root@rac1 ~]# ocrconfig -export ocrexp.exp
（3）启动CRS
节点一：
[root@rac1 ~]# crsctl start crs
Attempting to start CRS stack
The CRS stack will be started shortly
节点二：
[root@rac2 ~]# crsctl start crs
Attempting to start CRS stack
The CRS stack will be started shortly
[root@rac2 ~]# crs_stat -t
Name Type Target State Host
------------------------------------------------------------
ora....B1.inst application ONLINE ONLINE rac1
ora....B2.inst application ONLINE ONLINE rac2
ora.RACDB.db application ONLINE ONLINE rac1
ora....SM1.asm application ONLINE ONLINE rac1
ora....C1.lsnr application ONLINE ONLINE rac1
ora.rac1.gsd application ONLINE ONLINE rac1
ora.rac1.ons application ONLINE ONLINE rac1
ora.rac1.vip application ONLINE ONLINE rac1
ora....SM2.asm application ONLINE ONLINE rac2
ora....C2.lsnr application ONLINE ONLINE rac2
ora.rac2.gsd application ONLINE ONLINE rac2
ora.rac2.ons application ONLINE ONLINE rac2
ora.rac2.vip application ONLINE ONLINE rac2
（4）破坏OCR中的内容
[root@rac2 ~]# dd if=/dev/zero of=/dev/raw/raw1 bs=1024 count=102400
102400+0 records in
102400+0 records out
104857600 bytes (105 MB) copied, 41.7897 seconds, 2.5 MB/s
（5）检查集群状态，OCR一致性：
[root@rac2 ~]# crs_stat -t
CRS-0184: Cannot communicate with the CRS daemon.
[root@rac2 ~]# ocrcheck
PROT-601: Failed to initialize ocrcheck
集群已经挂掉，一致性无法检查。
（6）使用Clusterware安装包中的clufy工具检查一致性
[root@rac1 cluvfy]# ./runcluvfy.sh comp ocr -n all
Verifying OCR integrity
Unable to retrieve nodelist from Oracle clusterware.
Verification cannot proceed.
检查失败。
（7）使用import恢复ocr内容。
[root@rac1 ~]# ocrconfig -import ocrexp.exp
（8）再次检查OCR
[root@rac1 ~]# ocrcheck
Status of Oracle Cluster Registry is as follows :
Version : 2
Total space (kbytes) : 104344
Used space (kbytes) : 3820
Available space (kbytes) : 100524
ID : 1731255225
Device/File Name : /dev/raw/raw1
Device/File integrity check succeeded
Device/File not configured
Cluster registry integrity check succeeded
（9）cluvfy工具检查
[root@rac1 cluvfy]# ./runcluvfy.sh comp ocr -n all
Verifying OCR integrity
Checking OCR integrity...
Checking the absence of a non-clustered configuration...
All nodes free of non-clustered, local-only configurations.
Uniqueness check for OCR device passed.
Checking the version of OCR...
OCR of correct Version "2" exists.
Checking data integrity of OCR...
Data integrity check for OCR passed.
OCR integrity check passed.
Verification of OCR integrity was successful.
检查也没问题。
（10）关闭CRS
OCR被破坏后CRS已经异常停止，但有些进程依然存活，如果不先关闭下CRS，直接启动CRS会无法启动。
节点一：
[root@rac1 crsd]# crsctl stop crs
Stopping resources.
Successfully stopped CRS resources
Stopping CSSD.
Shutting down CSS daemon.
Shutdown request successfully issued.
节点二：
[root@rac2 crsd]# crsctl stop crs
Stopping resources.
Successfully stopped CRS resources
Stopping CSSD.
Shutting down CSS daemon.
Shutdown request successfully issued.
（10）启动CRS
节点一：
[root@rac1 cluvfy]# crsctl start crs
Attempting to start CRS stack
The CRS stack will be started shortly
节点二：
[root@rac2 ~]# crsctl start crs
Attempting to start CRS stack
The CRS stack will be started shortly
[root@rac2 crsd]# crs_stat -t
Name Type Target State Host
------------------------------------------------------------
ora....B1.inst application ONLINE ONLINE rac1
ora....B2.inst application ONLINE ONLINE rac2
ora.RACDB.db application ONLINE ONLINE rac2
ora....SM1.asm application ONLINE ONLINE rac1
ora....C1.lsnr application ONLINE ONLINE rac1
ora.rac1.gsd application ONLINE ONLINE rac1
ora.rac1.ons application ONLINE ONLINE rac1
ora.rac1.vip application ONLINE ONLINE rac1
ora....SM2.asm application ONLINE ONLINE rac2
ora....C2.lsnr application ONLINE ONLINE rac2
ora.rac2.gsd application ONLINE ONLINE rac2
ora.rac2.ons application ONLINE ONLINE rac2
ora.rac2.vip application ONLINE ONLINE rac2
[root@rac2 crsd]# crsctl check crs
CSS appears healthy
CRS appears healthy
EVM appears healthy