The media summary report available on the NetBackup admin console or java GUI, if set to verbose, will identify frozen media.
There are logfiles to be searched at
/usr/openv/netbackup/db/error
# grep -i freezing /usr/openv/netbackup/db/error/log_1128916800
1128972526 1 132 8 bobs-server 197921 197920 0 bobs-server bptm FREEZING media id 000290, it has had at least 3 errors in the last 12 hour(s)
If you back them up then you could restore old logfilesMessage was edited by:
Bob Stump