环境： RHEL 6.5 + Oracle GI 11.2.0.4 (2 nodes)
参考MOS文档
How to Deconfigure/Reconfigure(Rebuild OCR) or Deinstall Grid Infrastructure (文档 ID 1377349.1)
1.前期准备
确认各节点都是unpin的状态：
<GI_HOME>/bin/olsnodes -s -t
If a node is pinned, unpin it first, i.e. as root user:
<GI_HOME>/bin/crsctl unpin css -n <racnode1>
尽可能收集全集群相关的信息：
Before deconfiguring, collect the following as grid user if possible to generate a list of user resources to be added back to the cluster after reconfigure finishes:
$GRID_HOME/bin/crsctl stat res -t
$GRID_HOME/bin/crsctl stat res -p
$GRID_HOME/bin/crsctl query css votedisk
$GRID_HOME/bin/ocrcheck
$GRID_HOME/bin/oifcfg getif
$GRID_HOME/bin/srvctl config nodeapps -a
$GRID_HOME/bin/srvctl config scan
$GRID_HOME/bin/srvctl config asm -a
$GRID_HOME/bin/srvctl config listener -l <listener-name> -a
$DB_HOME/bin/srvctl config database -d <dbname> -a
$DB_HOME/bin/srvctl config service -d <dbname> -s <service-name> -v
2.删除GI
需要使用root用户：
# <$GRID_HOME>/crs/install/rootcrs.pl -deconfig -force -verbose
# <$GRID_HOME>/crs/install/rootcrs.pl -deconfig -force -verbose -lastnode
先去节点2（所有远端节点）执行：
<$GRID_HOME>/crs/install/rootcrs.pl -deconfig -force -verbose
[root@jystdrac2 ~]# /opt/app/11.2.0/grid/crs/install/rootcrs.pl -deconfig -force -verbose
Using configuration parameter file: /opt/app/11.2.0/grid/crs/install/crsconfig_params
Network exists: 1/192.168.1.0/255.255.255.0/eth2, type static
VIP exists: /jystdrac1-vip/192.168.1.62/192.168.1.0/255.255.255.0/eth2, hosting node jystdrac1
VIP exists: /jystdrac2-vip/192.168.1.64/192.168.1.0/255.255.255.0/eth2, hosting node jystdrac2
GSD exists
ONS exists: Local port 6100, remote port 6200, EM port 2016
CRS-2673: Attempting to stop 'ora.registry.acfs' on 'jystdrac2'
CRS-2677: Stop of 'ora.registry.acfs' on 'jystdrac2' succeeded
CRS-2791: Starting shutdown of Oracle High Availability Services-managed resources on 'jystdrac2'
CRS-2673: Attempting to stop 'ora.crsd' on 'jystdrac2'
CRS-2790: Starting shutdown of Cluster Ready Services-managed resources on 'jystdrac2'
CRS-2673: Attempting to stop 'ora.oc4j' on 'jystdrac2'
CRS-2673: Attempting to stop 'ora.asm' on 'jystdrac2'
CRS-2677: Stop of 'ora.asm' on 'jystdrac2' succeeded
CRS-2677: Stop of 'ora.oc4j' on 'jystdrac2' succeeded
CRS-2672: Attempting to start 'ora.oc4j' on 'jystdrac1'
CRS-2676: Start of 'ora.oc4j' on 'jystdrac1' succeeded
CRS-2792: Shutdown of Cluster Ready Services-managed resources on 'jystdrac2' has completed
CRS-2677: Stop of 'ora.crsd' on 'jystdrac2' succeeded
CRS-2673: Attempting to stop 'ora.mdnsd' on 'jystdrac2'
CRS-2673: Attempting to stop 'ora.drivers.acfs' on 'jystdrac2'
CRS-2673: Attempting to stop 'ora.ctssd' on 'jystdrac2'
CRS-2673: Attempting to stop 'ora.evmd' on 'jystdrac2'
CRS-2673: Attempting to stop 'ora.asm' on 'jystdrac2'
CRS-2677: Stop of 'ora.mdnsd' on 'jystdrac2' succeeded
CRS-2677: Stop of 'ora.evmd' on 'jystdrac2' succeeded
CRS-2677: Stop of 'ora.drivers.acfs' on 'jystdrac2' succeeded
CRS-2677: Stop of 'ora.ctssd' on 'jystdrac2' succeeded
CRS-2677: Stop of 'ora.asm' on 'jystdrac2' succeeded
CRS-2673: Attempting to stop 'ora.cluster_interconnect.haip' on 'jystdrac2'
CRS-2677: Stop of 'ora.cluster_interconnect.haip' on 'jystdrac2' succeeded
CRS-2673: Attempting to stop 'ora.cssd' on 'jystdrac2'
CRS-2677: Stop of 'ora.cssd' on 'jystdrac2' succeeded
CRS-2673: Attempting to stop 'ora.crf' on 'jystdrac2'
CRS-2677: Stop of 'ora.crf' on 'jystdrac2' succeeded
CRS-2673: Attempting to stop 'ora.gipcd' on 'jystdrac2'
CRS-2677: Stop of 'ora.gipcd' on 'jystdrac2' succeeded
CRS-2673: Attempting to stop 'ora.gpnpd' on 'jystdrac2'
CRS-2677: Stop of 'ora.gpnpd' on 'jystdrac2' succeeded
CRS-2793: Shutdown of Oracle High Availability Services-managed resources on 'jystdrac2' has completed
CRS-4133: Oracle High Availability Services has been stopped.
Removing Trace File Analyzer
Successfully deconfigured Oracle clusterware stack on this node
再次查询验证会提示集群件没有配置：
[root@jystdrac2 ~]# su - grid
[grid@jystdrac2 ~]$ crsctl stat res -t
CRS-4047: No Oracle Clusterware components configured.
CRS-4000: Command Status failed, or completed with errors.
[grid@jystdrac2 ~]$ crsctl stat res -t -init
CRS-4047: No Oracle Clusterware components configured.
CRS-4000: Command Status failed, or completed with errors.
[grid@jystdrac2 ~]$
回到节点1操作：
<$GRID_HOME>/crs/install/rootcrs.pl -deconfig -force -verbose -lastnode
[root@jystdrac1 ~]# /opt/app/11.2.0/grid/crs/install/rootcrs.pl -deconfig -force -verbose -lastnode
Using configuration parameter file: /opt/app/11.2.0/grid/crs/install/crsconfig_params
CRS resources for listeners are still configured
Network exists: 1/192.168.1.0/255.255.255.0/eth2, type static
VIP exists: /jystdrac1-vip/192.168.1.62/192.168.1.0/255.255.255.0/eth2, hosting node jystdrac1
GSD exists
ONS exists: Local port 6100, remote port 6200, EM port 2016
CRS-2673: Attempting to stop 'ora.registry.acfs' on 'jystdrac1'
CRS-2677: Stop of 'ora.registry.acfs' on 'jystdrac1' succeeded
CRS-2673: Attempting to stop 'ora.crsd' on 'jystdrac1'
CRS-2790: Starting shutdown of Cluster Ready Services-managed resources on 'jystdrac1'
CRS-2673: Attempting to stop 'ora.oc4j' on 'jystdrac1'
CRS-2673: Attempting to stop 'ora.OCR.dg' on 'jystdrac1'
CRS-2677: Stop of 'ora.OCR.dg' on 'jystdrac1' succeeded
CRS-2673: Attempting to stop 'ora.asm' on 'jystdrac1'
CRS-2677: Stop of 'ora.asm' on 'jystdrac1' succeeded
CRS-2677: Stop of 'ora.oc4j' on 'jystdrac1' succeeded
CRS-2792: Shutdown of Cluster Ready Services-managed resources on 'jystdrac1' has completed
CRS-2677: Stop of 'ora.crsd' on 'jystdrac1' succeeded
CRS-2673: Attempting to stop 'ora.ctssd' on 'jystdrac1'
CRS-2673: Attempting to stop 'ora.evmd' on 'jystdrac1'
CRS-2673: Attempting to stop 'ora.asm' on 'jystdrac1'
CRS-2677: Stop of 'ora.evmd' on 'jystdrac1' succeeded
CRS-2677: Stop of 'ora.asm' on 'jystdrac1' succeeded
CRS-2673: Attempting to stop 'ora.cluster_interconnect.haip' on 'jystdrac1'
CRS-2677: Stop of 'ora.ctssd' on 'jystdrac1' succeeded
CRS-2677: Stop of 'ora.cluster_interconnect.haip' on 'jystdrac1' succeeded
CRS-2673: Attempting to stop 'ora.cssd' on 'jystdrac1'
CRS-2677: Stop of 'ora.cssd' on 'jystdrac1' succeeded
CRS-2672: Attempting to start 'ora.cssdmonitor' on 'jystdrac1'
CRS-2676: Start of 'ora.cssdmonitor' on 'jystdrac1' succeeded
CRS-2672: Attempting to start 'ora.cssd' on 'jystdrac1'
CRS-2672: Attempting to start 'ora.diskmon' on 'jystdrac1'
CRS-2676: Start of 'ora.diskmon' on 'jystdrac1' succeeded
CRS-2676: Start of 'ora.cssd' on 'jystdrac1' succeeded
CRS-4611: Successful deletion of voting disk +OCR.
ASM de-configuration trace file location: /tmp/asmcadc_clean2018-04-24_02-45-36-PM.log
ASM Clean Configuration START
ASM Clean Configuration END
ASM with SID +ASM1 deleted successfully. Check /tmp/asmcadc_clean2018-04-24_02-45-36-PM.log for details.
CRS-2791: Starting shutdown of Oracle High Availability Services-managed resources on 'jystdrac1'
CRS-2673: Attempting to stop 'ora.crf' on 'jystdrac1'
CRS-2673: Attempting to stop 'ora.ctssd' on 'jystdrac1'
CRS-2673: Attempting to stop 'ora.cluster_interconnect.haip' on 'jystdrac1'
CRS-2673: Attempting to stop 'ora.mdnsd' on 'jystdrac1'
CRS-2677: Stop of 'ora.crf' on 'jystdrac1' succeeded
CRS-2677: Stop of 'ora.mdnsd' on 'jystdrac1' succeeded
CRS-2677: Stop of 'ora.cluster_interconnect.haip' on 'jystdrac1' succeeded
CRS-2677: Stop of 'ora.ctssd' on 'jystdrac1' succeeded
CRS-2673: Attempting to stop 'ora.cssd' on 'jystdrac1'
CRS-2677: Stop of 'ora.cssd' on 'jystdrac1' succeeded
CRS-2673: Attempting to stop 'ora.gipcd' on 'jystdrac1'
CRS-2677: Stop of 'ora.gipcd' on 'jystdrac1' succeeded
CRS-2673: Attempting to stop 'ora.gpnpd' on 'jystdrac1'
CRS-2677: Stop of 'ora.gpnpd' on 'jystdrac1' succeeded
CRS-2793: Shutdown of Oracle High Availability Services-managed resources on 'jystdrac1' has completed
CRS-4133: Oracle High Availability Services has been stopped.
Removing Trace File Analyzer
Successfully deconfigured Oracle clusterware stack on this node
[root@jystdrac1 ~]#
至此，就成功删除了GI。