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I see you have tried the command while I was busy typing this message...
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If you STILL don't believe us, here's another NBU 5.1 TechNote:
http://seer.entsupport.symantec.com/docs/236274.htm
To initiate manual cleanup, perform the following:
# /
usr/openv/netbackup/bin/admincmd/bpimage -cleanup -allclients
Why not TRY the command??
Catalog cleanup should be logged in bpdbm log.
Please see what 'bpconfig -L' command produces (I don't have a 6.0 server around to test). I'm curious to know if the 'DB Clean Interval' and 'DB Clean Wait Time' are present.
Mail Admin: *NULL*
Job Retry Delay: 10 minutes
Max Jobs/Client: 4
Backup Tries: 1 in 1 hours
Keep Logs: 20 days
Max drives/master: 0
Compress DB Files: (not enabled)
Media Mnt Timeout: 0 minutes (unlimited)
Display Reports: 24 hours ago
Keep TIR Info: 1 days
Prep Interval: 4 hours (default)
Max Backup Copies: 2
DB Clean Interval: 12 hours
DB Clean Wait Time: 60 minutes
Policy Update Interval: 10 minutes