How to : Clean deinstall of Oracle RAC (CRS since 11.2.0.1)

How to : Clean deinstall of Oracle RAC (CRS since 11.2.0.1) –> On Linux Red Hat 5

First check your CRS Version to see if this doc is applicable:

crsctl query crs activeversion

If CRS version is 11.2, it’s ok to start 😉 :

–> Stop all CRS on the two nodes.

with oracle account or root (I recommand to use root account)

crsctl stop crs -f

or (root account only)

/etc/init.d/ohas stop

-> Check that no more processes are running

Then, delete the Oracle_base directory and Oracle_GRID directory. I don’t make it with « deinstall » script, because some files or directory always exists and the reinstall of complete CRS failed.

Cleanup inittab, remove :

"h1:3:respawn:/sbin/init.d/init.ohasd run >/dev/null 2>&1 </dev/null"

==> cleaning (delete) the files / directory bellow

rm -rf /etc/oracle
rm -rf /var/tmp/.oracle
rm -rf /tmp/.oracle
rm -rf /var/opt/oracle

Launch this command to delete the rc* file belong to ohas :

find /etc/rc*.d -name *ohasd -exec rm {} \;

==> Check your ASM Device and delete the « marked » files

Example :

blkid /dev/mapper/orap1

/dev/mapper/orap1: LABEL="" TYPE="oracleasm"

Launch the command bellow : (Warning : this command delete all of DATA in the ASM drives !!!)

dd if=/dev/zero of=/dev/mapper/orap1 bs=1024k count=100

check again the mark of the file

blkid /dev/mapper/orap1

Delete other files

rm /etc/oratab
rm -f /usr/local/bin/dbhome /usr/local/bin/coraenv /usr/local/bin/oraenv


Now, you can start the complete installation of Oracle Grid infrastructure 11.2

Thanks to « Uggla » Blog (http://uggla.free.fr/wordpress) and the help of Arkzoyd (http://blog.arkzoyd.com), that allow me to make a clean deinstall of my cluster 😉