vnetd + Oracle RMAN restore from tape using NetBackup

I had a unique issue when working on a retore using rman, the issue was the restore was started with 10 channels and the restore was happening with one channel and the other channels were not reading any data and finally failed with “cannot connect socket” error from netbackup side.

The rman side failed with a generic MML error as below.

ORA-19624: operation failed, retry possible
ORA-19507: failed to retrieve sequential file, handle="AAAPRD_dbf_sokhhtgt_689501725", parms=""
ORA-27029: skgfrtrv: sbtrestore returned error
ORA-19511: Error received from media manager layer, error text:
Failed to process backup file


This issue went for a day or two and finally with the help of a system admin we resolved the issue.


The issue was like below :

1.The database server failed to establish more vnetd connections from master/media servers of Netbackup.

1. vnetd is used by default from NBU 6.0 and up. So NetBackup uses the firewalled configuration even if you do not have a firewall.

2. If vnetd fails NBU failback to normal deamon port connection (bpcd, bpbrm etc).


This was finally fixed by changing the per_source value in /etc/xinetd.conf from 10 to UNLIMITED after whcih all the channels running fine.