5-10-2007 12:50:01 am: COMN-3.25-180 [nmID=A0022]
NSS02.70-5008: Volume MNR-SERVER/SYS had an error
(20012(beastTree.c[510])) at block 1621100(file block -1621100) (ZID 1)

The above message has appeared several times on the server console
during an overnight backup. Does anyone know what it means and how
to fix the problem ?

During the day before, all volumes except SYS suddenly dismounted.
This appeared to happen after a Kaspersky antivirus update, so KLABAV
was removed from the autoexec.ncf and the server was reset. Everything
seemed to come back up OK and behave normally until running the backup.

Presumably this isn't a Kaspersky problem since it isn't loaded

Platform is:
IBM x206 server P4 3.4GHz with 2Gb RAM and U320 SCSI
1x ServerRAID 6i + Controller SS
3x 36Gb 15K U320 SCSI Hot Swap Hard Drives plus 1x Spare
NW65SP6 + GW702SP2 + BE9.10 rev 1156