Change Existing Hostnames in 10g RAC cluster !!!

Recently we wanted to upgrade an Oracle 10g (10.2.0.5) RAC database┬áhaving ASM storage to higher version i.e. Oracle 11gR2 (11.2.0.3). While checking the prechecks for the upgradation, we noticed that the 10g RAC Cluster was configured using the hostnames having ‘_’ in their names. The private and virtual hostnames were…