Clusterware Rolling Upgrade from Version 10.2.0.1 to 10.2.0.5.

In this article I'll show you how to upgrade the Oracle Clusterware from Oracle version 10201 to 10205.
To upgrade the Clusterware to 10205, you need to download the patch set p8202632_10205_LINUX.zip  from the oracle. Please click on the below link for the same.
https://updates.oracle.com/Orion/Services/download/p8202632_10205_LINUX.zip?aru=12794232&patch_file=p8202632_10205_LINUX.zip

I'll do the rolling upgrade for Oracle Clusterware and this requires no downtime. For this I'll follw the below steps.
1. Stop the instance and node apps services on the node from where you intended to run the patch setup.
2. Take the backup of $CRS_HOME, $ORACLE_HOME and oracle inventory (oraInventory).
3. Backup the Clusterware component like OCR and VOTEDISK.
4. Proceed with the Clusterware installation patch setup.

Lets check the instance status from the other node

Backup the Clusterware Home and Database Home
# tar -czvf  /u01/app/oracle/old_oraInventory  /u01/app/oracle/oraInventory --->backup oraInventory
# tar -czvf  /u01/app/10.2.0/crs_old  /u01/app/10.2.0/crs ---> backup the CRS home
# tar -czvf  /u01/app/oracle/product/10.2.0/db_1_old  /u01/app/oracle/product/10.2.0/db_1 --> DB home
Backup the Clusterware components which are OCR and Votedisk.
##OCR backup
cd $CRS_HOME/bin
#./ocrconfig -export /ocrdisk/ocrexpbkp.dmp
##Votedisk backup
#./crsctl query css votedisk
#dd if=/votedisk/vote of=/votedisk/vote_backup.dmp bs=4k

Now install the patch set installer.

In my next post I'll show you how to delete the existing node from RAC.