重新配置与卸载11gR2 Grid Infrastructure
Oracle 11g R2 Grid Infrastructure 的安装与配置较之前的版本提供了更多的灵活性。在Grid Infrastructure安装完毕前执行root.sh经常容易出现错误，并且需要修复该错误才能得以继续。
在这个版本中我们可以直接通过执行脚本rootcrs.pl来重新配置Grid Infrastructure而无需先卸载Grid Infrastructure，然后修复故障后进行再次安装。下面描述了rootcrs.pl的用法以及使用deinstall彻底卸载Grid Infrastructure。
1、rootcrs.pl命令介绍
[python]
#命令位置:$GRID_HOME/crs/install
#命令说明:
# 该命令主要是用于对crs进行维护与管理，包括patch,upgrade,downgrade,deconfig等等
# perldoc rootcrs.pl执行这个命令获得完整的介绍
[root@linux1 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
#对于执行root.sh失败时，我们可以通过该命令以-deconfig 参数来清除crs的配置信息，然后根据log修复故障或使用patch之后再重新执行root.sh
#对于该命令的patch,upgrade,downgrade用法再此不作详细介绍
2、重新配置Grid Infrastructure及ASM
[python]
#重新配置Grid Infrastructure并不会移除已经复制的二进制文件，仅仅是回复到配置crs之前的状态，下面是其步骤
a、使用root用户登录，并执行下面的命令(所有节点，但最后一个节点除外)
# perl $GRID_HOME/crs/install/rootcrs.pl -verbose -deconfig -force
b、同样使用root用户在最后一个节点执行下面的命令。该命令将清空ocr 配置和voting disk
# perl $GRID_HOME/crs/install/rootcrs.pl -verbose -deconfig -force -lastnode
c、如果使用了ASM磁盘，继续下面的操作以使得ASM重新作为候选磁盘(清空所有的ASM磁盘组)
# dd if=/dev/zero of=/dev/sdb1 bs=1024 count=100
# /etc/init.d/oracleasm deletedisk DATA /dev/sdb1
# /etc/init.d/oracleasm createdisk DATA /dev/sdb1
3、彻底删除Grid Infrastructure
[python]
#11g R2 Grid Infrastructure也提供了彻底卸载的功能，deinstall该命令取代了使用OUI方式来清除clusterware以及ASM，回复到安装grid之前的环境。
#该命令将停止集群，移除二进制文件及其相关的所有配置信息。
#命令位置:$GRID_HOME/deinstall
#下面是该命令操作的具体事例，操作期间，需要提供一些交互信息，以及在新的session以root身份清除一些/tmp下的文件
[root@linux1 bin]# ./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
[root@linux1 bin]# cd ../deinstall/
[root@linux1 deinstall]# pwd
/u01/app/11.2.0/grid/deinstall
[root@linux1 deinstall]# ./deinstall
You must not be logged in as root to run ./deinstall.
Log in as Oracle user and rerun ./deinstall.
[root@linux1