Hi Aps,
Do you have your oracle home configured under clustered drive or it is installed locally on the server.
If it is installed on clustered drive suggestion here is to failover the DB+CI on single host and perform the oracle upgrade.
Post upgrade failover to other server and test the startup and shutdown procedure. Fix any issues with environment variables.
If the oracle s/w is installed locally, suggestion here is to install oracle s/w on node1. Perform a tar backup and restore the same on Node2.
Hope this helps.
Regards,
Deepak Kori
