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Tuesday, July 18, 2017

Deinstall of Grid Infrastructure Cluster

Step 1:

How to clean up a failed Grid Infrastructure installation.
It specifically focuses on what to do if the "root.sh" script fails during this process and you want to rewind and start again.


On all cluster nodes except the last, run the following command as the "root" user.

perl $GRID_HOME/crs/install/rootcrs.pl -verbose -deconfig -force


Step 2:

On the last cluster node, run the following command as the "root" user.

perl $GRID_HOME/crs/install/rootcrs.pl -verbose -deconfig -force -lastnode

This final command will blank the OCR configuration and voting disk.

You should be in a position to rerun the "root.sh" file now, but if you are using ASM, you will need to prepare your ASM disks before doing so.

Step 3: As grid user, run $GRID_HOME/deinstall/deinstall

finally as root in all racnodes

rm -rf /etc/oraInst.loc
rm -rf /opt/ORCLfmap

Step 4:

ASM Disks

Once you attempt an installation, your ASM disks are marked as being used, so they can no longer be used as candidate disks. To revert them to candidate disk do the following.

Overwrite the header for the relevant partitions using the "dd" command.

dd if=/dev/zero of=/dev/sdb1 bs=1024 count=100

Remove and create the ASM disk for each partition.

/etc/init.d/oracleasm deletedisk DATA /dev/sdb1
 /etc/init.d/oracleasm createdisk DATA /dev/sdb1

The disks will now be available as candidate disks.