[Bacula-users] Bacula wants to use volume that is already in use

Hello List,

I am using Bacula 3.0.3 in conjunction with a 4 drive autochanger and 
"Prefer Mounted Volumes" set to "No." Unfortunately, I have had a number 
of problems with Bacula trying to back up to a volume that is already 
being used for another job. As a result, the job will continue to wait 
for the tape in the other drive to become free, essentially eliminating 
any benefit that the job concurrency might have had.

This problem is occurring on a nightly basis, with some nights being 
worse than others. If I tell Bacula to prefer mounted volumes instead, 
the backups complete just fine, but then I am not taking advantage of 
the large tape library that we have at our disposal.

Here is an example of what I see in the logs. This will repeat until the 
tape is finally freed from the other drive (which can sometimes be hours).

backup.domain.tld-dir JobId 4783: Start Backup JobId 4783, 
Job=jobname.2010-02-24_02.00.00_11
backup.domain.tld-dir JobId 4783: Using Device "Drive-5"
backup.domain.tld-sd JobId 4783: 3301 Issuing autochanger "loaded? drive 
5" command.
backup.domain.tld-sd JobId 4783: 3302 Autochanger "loaded? drive 5", 
result: nothing loaded.
backup.domain.tld-sd JobId 4783: Warning: Volume "023071" wanted on 
"Drive-5" (/dev/nst3) is in use by device "Drive-4" (/dev/nst2)
backup.domain.tld-sd JobId 4783: 3301 Issuing autochanger "loaded? drive 
5" command.
backup.domain.tld-sd JobId 4783: 3302 Autochanger "loaded? drive 5", 
result: nothing loaded.
backup.domain.tld-sd JobId 4783: Warning: Volume "023071" wanted on 
"Drive-5" (/dev/nst3) is in use by device "Drive-4" (/dev/nst2)
backup.domain.tld-sd JobId 4783: 3301 Issuing autochanger "loaded? drive 
5" command.
backup.domain.tld-sd JobId 4783: 3302 Autochanger "loaded? drive 5", 
result: nothing loaded.
backup.domain.tld-sd JobId 4783: 3301 Issuing autochanger "loaded? drive 
5" command.
backup.domain.tld-sd JobId 4783: 3302 Autochanger "loaded? drive 5", 
result: nothing loaded.
backup.domain.tld-sd JobId 4783: Warning: mount.c:227 Open device 
"Drive-5" (/dev/nst3) Volume "023071" failed: ERR=dev.c:491 Unable to 
open device "Drive-5" (/dev/nst3): ERR=No medium found

Any help would be greatly appreciated.

-- 
Dave


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