This is an OES SP2 server, with no NSS volumes and backed up by
CommVault 6.1.

When the server starts up, SMS is running fine: I can see TSAs when I do
smsconfig -t. However, at some point after a CommVault backup or restore
starts, SMS dies - smsconfig complains it can't communicate with smdr,
and I can't do any more backing up or restores.

If I restart smdrd (/etc/init.d/novell-smdrd restart), everything
returns to normal .. until the next time.

Can anyone suggest where to start troubleshooting this one?