problem resolved after getting the below technote.
[ Dear VERITAS ]
As per the above technote we modify below files. Why cant VCS use $HOSTNAME at below files. After this change of hostnames at OS level does not required to alter below files (Please correct if I am wrong).
/etc/llttab, /etc/llthosts, /etc/VRTSvcs/conf/sysname, /etc/VRTSvcs/conf/config/main.cf