在Grid Infrastructure安裝完畢前需要執行root.sh，但是在執行的過程中經常容易出現錯誤，並且需要修復該錯誤才能得以繼續。11gR2版本中我們可以直接透過執行指令碼rootcrs.pl來重新配置Grid Infrastructure,而無需先解除安裝Grid Infrastructure，然後修復故障後進行再次安裝。下面描述了rootcrs.pl的用法以。該命令主要是用於對crs進行維護與管理，包括patch,upgrade,downgrade,deconfig等等

命令位置:$GRID_HOME/crs/install
[root@rac1 install]# ./rootcrs.pl -h
Unknown option: h
Usage:
      rootcrs.pl [-verbose] [-upgrade | -patch] [-hahome ]
                 [-paramfile ] 
                 [-deconfig | -downgrade] [-force] [-lastnode]
                 [-downgrade] [-oldcrshome ] [-version ]  
                 [-unlock [-crshome ]]

      Options:
       -verbose    Run this script in verbose mode
       -upgrade    Oracle HA is being upgraded from previous version
       -patch      Oracle HA is being upgraded to a patch version
       -hahome     Complete path of Oracle Clusterware home
       -paramfile  Complete path of file specifying HA parameter values
       -lastnode   Force the node this is executing on to be considered the
                   last node of the install and perform actions associated
                   with configurig the last node
       -downgrade  Downgrade the clusterware
       -version    For use with downgrade; special handling is required if
                   downgrading to 9i. This is the old crs version in the format
                   A.B.C.D.E (e.g 11.1.0.6.0).
       -deconfig   Remove Oracle Clusterware to allow it to be uninstalled or reinstalled.
       -force      Force the executon of steps in delete that cannot be verified 
                   to be safe
       -unlock     Unlock CRS home 
       -crshome    Complete path of crs home. Use with unlock option.
       -oldcrshome For use with downgrade. Complete path of the old crs home.

      If neither -upgrade nor -patch is supplied, a new install is performed

      To see the full manpage for this program, execute:
        perldoc rootcrs.pl

重新配置Grid Infrastructure不會移除已經複製的二進位制檔案，僅僅是恢復到配置crs之前的狀態，下面是其步驟

1、使用root使用者登入，並執行下面的命令(所有節點，但最後一個節點除外)

[root@rac1 install]# /u01/app/grid/crs/install/rootcrs.pl -verbose -deconfig -force

2、同樣使用root使用者在最後一個節點執行下面的命令。該命令將清空ocr 配置和voting disk

[root@rac1 install]# /u01/app/grid/crs/install/rootcrs.pl -verbose -deconfig -force -lastnode

3、清空所有的ASM磁碟組,使得ASM重新作為候選磁碟

[root@rac1 install]# dd if=/dev/zero of=/dev/sdb1 bs=1024 count=100

[root@rac1 install]# /etc/init.d/oracleasm deletedisk DATA /dev/sdb1

[root@rac1 install]# /etc/init.d/oracleasm createdisk DATA /dev/sdb1
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pxboracle@live.com
2014.5.11 10:07
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重新配置 11gR2 Grid Infrastructure

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