在oracle 10g ac cluster安装初始阶段，会有窗口提示你对ocr盘选择镜像或不做镜像，如果在安装时我们只规划了一个ocr盘，如何在安装完后增加镜像和删除镜像，以下为具体步骤:

第一.增加/dev/rocr2_lv镜像:

    crs集群状态已经启动，并且数据库也已经启动

1.查看ocr盘状态

[root@p650:/crs/app/oracle/product/crs_1]#cd bin
[root@p650:/crs/app/oracle/product/crs_1/bin]#pwd
/crs/app/oracle/product/crs_1/bin
[root@p650:/crs/app/oracle/product/crs_1/bin]#./ocrcheck
Status of Oracle Cluster Registry is as follows :
         Version                  :          2
         Total space (kbytes)     :     130852
         Used space (kbytes)      :       3280
         Available space (kbytes) :     127572
         ID                       :  614588822
         Device/File Name         : /dev/rocrlv
                                    Device/File integrity check succeeded

                                    Device/File not configured

         Cluster registry integrity check succeeded

从上面可以看出，只有一个ocr盘

2.从操作系统上增加ocr盘，必须是两边节点都可以看到的共享盘

smitty mklv   lv名字为/dev/rocr2_lv

chown root:ointall /dev/rocr2_lv

chmod 640 /dev/rocr2_lv

3.crs集群中增加ocr盘，用ocrconfig命令

[root@p650:/crs/app/oracle/product/crs_1/bin]#./ocrconfig -replace ocrmirror /dev/rocr2_lv

4.检查结果

[root@p650:/crs/app/oracle/product/crs_1/bin]#./ocrcheck
Status of Oracle Cluster Registry is as follows :
         Version                  :          2
         Total space (kbytes)     :     130852
         Used space (kbytes)      :       3280
         Available space (kbytes) :     127572
         ID                       :  614588822
         Device/File Name         : /dev/rocrlv
                                    Device/File integrity check succeeded
         Device/File Name         : /dev/rocr2_lv
                                    Device/File integrity check succeeded

         Cluster registry integrity check succeeded

[root@p650:/etc]#cd oracle
[root@p650:/etc/oracle]#ls
ocr.loc   oprocd    scls_scr
[root@p650:/etc/oracle]#more ocr.locl
ocr.locl: A file or directory in the path name does not exist.
[root@p650:/etc/oracle]#more ocr.loc
#Device/file  getting replaced by device /dev/rocr2_lv
ocrconfig_loc=/dev/rocrlv
ocrmirrorconfig_loc=/dev/rocr2_lv
local_only=false
[root@p650:/etc/oracle]#
       ocr.loc文件记录ocr盘路径

 第二.删除/dev/rocr2_lv镜像:

1.crs集群中删除ocr镜像盘，用ocrconfig命令

[root@p650:/crs/app/oracle/product/crs_1/bin]#./ocrconfig -replace ocrmirror

2.检查结果

[root@p650:/crs/app/oracle/product/crs_1/bin]#./ocrcheck
Status of Oracle Cluster Registry is as follows :
         Version                  :          2
         Total space (kbytes)     :     130852
         Used space (kbytes)      :       3280
         Available space (kbytes) :     127572
         ID                       :  614588822
         Device/File Name         : /dev/rocrlv
                                    Device/File integrity check succeeded

                                    Device/File not configured

         Cluster registry integrity check succeeded

root@p650:/etc/oracle]#more ocr.loc
ocrconfig_loc=/dev/rocrlv
local_only=false
[root@p650:/etc/oracle]#

删除/dev/rocr2_lv成功