Oracle10g OCR及Voting Disk的备份

 在Oracle10g RAC环境中，OCR及Voting Disk对于集群来说都是非常重要的。

 通过命令./ocrconfig -showbackup 显示备份

[oracle@swrac1 bin]$ ./ocrconfig -showbackup

swrac1     2008/03/13 18:58:37     /oracle/oracle/product/10.2.0/crs/cdata/crs

swrac1     2008/03/13 14:58:37     /oracle/oracle/product/10.2.0/crs/cdata/crs

swrac1     2008/03/13 10:58:37     /oracle/oracle/product/10.2.0/crs/cdata/crs

swrac1     2008/03/12 02:58:30     /oracle/oracle/product/10.2.0/crs/cdata/crs

swrac1     2008/03/02 02:57:42     /oracle/oracle/product/10.2.0/crs/cdata/crs

 注意这个备份只会存储在一个节点上，并非所有节点都会记录这个备份。
在备份节点的相应目录下我们可以找到这些备份:
 cd /oracle/oracle/product/10.2.0/crs/cdata/crs

 ls

 [oracle@swrac1 crs]$ ls
 backup00.ocr  backup01.ocr  backup02.ocr  day_.ocr  day.ocr  week_.ocr  week.ocr

显示日、天、周备份

 

 当出现故障时，可以通过ocrconfig命令来执行恢复，通过帮助可以看到详细的用法：
  [oracle@swrac1 bin]$ ./ocrconfig --help
Name:
    ocrconfig - Configuration tool for Oracle Cluster Registry.

Synopsis:
        ocrconfig [option]
        option:
                -export [-s online]
                           - Export cluster register contents to a file
                -import                  

                           - Import cluster registry contents from a file
                -upgrade [ []]
                           - Upgrade cluster registry from previous version
                -downgrade [-version ]
                           - Downgrade cluster registry to the specified version
                -backuploc                

                           - Configure periodic backup location
                -showbackup              

                           - Show backup information
                -restore                 

                           - Restore from physical backup
                -replace ocr|ocrmirror []

                           - Add/replace/remove a OCR device/file
                -overwrite 

                         - Overwrite OCR configuration on disk
                -repair ocr|ocrmirror    

                         - Repair local OCR configuration
                -help                - Print out this help information

Note:
        A log file will be created in
        $ORACLE_HOME/log//client/ocrconfig_.log. Please ensure
        you have file creation privileges in the above directory before
        running this tool.

 

如果不出意外，恢复过程将会很简单，通过 ocrconfig -restore 就可以回复这里的物理备份。

   对于voting disk可以通过dd来进行备份。
首先通过 crsctl query css votedisk 命令可以找到voting disk的存储地

 

  [oracle@swrac1 bin]$ ./crsctl query css votedisk
 0.     0    /dev/raw/raw3
 1.     0    /dev/raw/raw4
 2.     0    /dev/raw/raw5

   然后通过dd备份：
    [oracle@swrac1 bin]$ dd if=/dev/raw/raw5 of=/oracle/oracle/votedisk.bak

    13809+0 records in
    13809+0 records out

   

  当需要恢复时，通过dd进行恢复即可。这个voting disk记录了什么内容呢？

   [oracle@swrac1 oracle]$ strings  votedisk.bak  | sort  -u
etoV
fSLC
ssLckcoT
SslcLlik
sSlcrEp0
swrac1
swrac2
}|{z
 通过strings可以将其中的字符串取出来看一个印象：