The dump that comes with RH6.2 (dump-0.4b15-1) barfs on multi volume sets.
Simple upgrade to dump-0.4b16-1 makes it work fine.
The problem is that dump-0.4b15-1 doesn't completely close the tape drive,
so it can't reopen the drive. Where can one find dump-0.4b16-1?
+ /sbin/dump -b 32 -d 61000 -B 320 -f /dev/st0 /d5
DUMP: Date of this level 0 dump: Sun May 14 07:32:55 2000
DUMP: Date of last level 0 dump: the epoch
DUMP: Dumping /dev/hdd5 (/d5) to /dev/st0
DUMP: Label: none
DUMP: mapping (Pass I) [regular files]
DUMP: mapping (Pass II) [directories]
DUMP: estimated 1978040 tape blocks on 5137.89 tape(s).
DUMP: Volume 1 started at: Sun May 14 07:32:56 2000
DUMP: dumping (Pass III) [directories]
DUMP: Closing /dev/st0
DUMP: Volume 1 completed at: Sun May 14 07:32:56 2000
DUMP: Change Volumes: Mount volume #2
DUMP: Is the new volume mounted and ready to go?: ("yes" or "no") yes
DUMP: Cannot open output "/dev/st0".
DUMP: Do you want to retry the open?: ("yes" or "no") no
fuser /dev/st0 shows that two instances of dump that didn't close the device.
'man dump | grep http'