How To Clear Oracle Clusterware Installation ?

There are two methods to do it.

Automatic

Run the following scripts as root user.

cd $ORA_CRS_HOME/install/

[root@vmlinux1 install]# sh rootdelete.sh

CRS-0210: Could not find resource 'ora.vmlinux1.LISTENER_VMLINUX1.lsnr'.
Shutting down Oracle Cluster Ready Services (CRS):
Stopping resources.
Successfully stopped CRS resources
Stopping CSSD.
Shutting down CSS daemon.
Shutdown request successfully issued.
Shutdown has begun. The daemons should exit soon.
Checking to see if Oracle CRS stack is down...
Oracle CRS stack is not running.
Oracle CRS stack is down now.
Removing script for Oracle Cluster Ready services
Updating ocr file for downgrade
Cleaning up SCR settings in '/etc/oracle/scls_scr'

[root@vmlinux1 install]# sh rootdeinstall.sh

Removing contents from OCR mirror device
2560+0 records in
2560+0 records out
Removing contents from OCR device
2560+0 records in
2560+0 records out

If you encounter any errors then clear clusterware installation manually.

 Manual 

On RedHat Linux.

rm /etc/oracle/*
rm -f /etc/init.d/init.cssd 
rm -f /etc/init.d/init.crs 
rm -f /etc/init.d/init.crsd 
rm -f /etc/init.d/init.evmd 
rm -f /etc/rc2.d/K96init.crs
rm -f /etc/rc2.d/S96init.crs
rm -f /etc/rc3.d/K96init.crs
rm -f /etc/rc3.d/S96init.crs
rm -f /etc/rc5.d/K96init.crs
rm -f /etc/rc5.d/S96init.crs
rm -Rf /etc/oracle/scls_scr
rm -f /etc/inittab.crs 
cp /etc/inittab.orig /etc/inittab


Check for the EVM,CRS and CSS processes and kill them.

ps -ef | grep d.bin


If the oracle services like listener,database etc are not running,
then remove the files from the following locations.

rm -f /var/tmp/.oracle/*
rm -f /tmp/.oracle/*

Remove ocr.loc from  "/etc/oracle"

rm -f /etc/oracle
Deinstall crs home using oracle universal installer

$ORA_CRS_HOME/oui/bin/runInstaller

Remove crs directory.

clean OCR and voting disks

Clear cluvfy related files.

rm -f /tmp/CVU*   

Restart the node before doing anything else.



Reference: Oracle Metalink