If for some reason you got the “rpc.metad: <hostname>: Permission denied” error while creating multiowner metaset (eg. for Oracle RAC; metaset -s oradg -M …) edit the /etc/group and add root to sysadmin group. Next, try to retry the command.
This error is strange strange, because I haven’t got it while creating metasets on S10U3. Hm.