Hello all,

I've had the following problem for ages (meaning multiple major 
revisions of bacula) and I've seen this come up from time to time on the 
mailing list, but I've never actually seen a resolution (please point me 
to one if it's been found).


background:

I run monthly Fulls and nightly Incrementals.  I have a 2 drive 
autochanger dedicated to my Incrementals.  I launch something like ~150 
Incremental jobs each night.  I am configured for 8 concurrent jobs on 
the Storage Daemon.


PROBLEM:

The first job(s) grab one of the 2 devices available in the changer 
(which is set to AutoSelect) and either load a tape, or use a tape from 
the previous evening.  All tapes in the changer are in the same 
Incremenal-Pool.

The second jobs(s) grab the other of the 2 devices available in the 
changer, but want to use the same tape that's just been mounted (or put 
into use) on the jobs that got launched first.  They will often literal 
wait the entire evening until 100's of jobs run through on only one 
device, until that tape is freed up, at which point it is unmounted from 
the first device and moved to the second.

Note, the behaviour seems to be to round-robin my 8 concurrency limit 
between the 2 available drives, which mean 4 jobs will run, and 4 jobs 
will block on waiting for the wanted Volume.  When the original 4 jobs 
are completed (not at the same time) additional jobs are launched that 
keep that wanted Volume in use.


LOG:

03-Nov 22:00 DIRECTOR JobId 267433: Start Backup JobId 267433, Job=JOB.
2012-11-03_22.00.00_0403-Nov 22:00 DIRECTOR JobId 267433: Using Device 
"L100-Drive-0"03-Nov 22:00 DIRECTOR JobId 267433: Sending Accurate 
information.
03-Nov 22:00 sd_L100_ JobId 267433: 3307 Issuing autochanger "unload 
slot 82, drive 0" command.
03-Nov 22:06 lawson-sd_L100_ JobId 267433: Warning: Volume "IM0108" 
wanted on "L100-Drive-0" (/dev/L100-Drive-0) is in use by device 
"L100-Drive-1" (/dev/L100-Drive-1)
03-Nov 22:09 sd_L100_ JobId 267433: Warning: Volume "IM0108" wanted on 
"L100-Drive-0" (/dev/L100-Drive-0) is in use by device "L100-Drive-1" 
(/dev/L100-Drive-1)
03-Nov 22:09 sd_L100_ JobId 267433: Warning: mount.c:217 Open device 
"L100-Drive-0" (/dev/L100-Drive-0) Volume "IM0108" failed: ERR=dev.c:513 
Unable to open device "L100-Drive-0" (/dev/L100-Drive-0): ERR=No medium 
found
.
.
.


CONFIGS (partial and seem pretty straight-forward):

Schedule {
   Name = "DefaultSchedule"
   Run = Level=Incremental                               sat-thu at 22:00
   Run = Level=Differential                              fri     at 22:00
}

JobDefs {
   Name = "DefaultJob"
   Type = Backup
   Level = Full
   Schedule = "DefaultSchedule"
   Incremental Backup Pool = Incremental-Pool
   Differential Backup Pool = Incremental-Pool
}

Pool {
   Name = Incremental-Pool
   Pool Type = Backup
   Storage = L100-changer
}

Storage {
   Name = L100-changer
   Device = L100-changer
   Media Type = LTO-3
   Autochanger = yes
   Maximum Concurrent Jobs = 8
}

Autochanger {
   Name = L100-changer
   Device = L100-Drive-0
   Device = L100-Drive-1
   Changer Device = /dev/L100-changer
}

Device {
   Name = L100-Drive-0
   Drive Index = 0
   Media Type = LTO-3
   Archive Device = /dev/L100-Drive-0
   AutomaticMount = yes;
   AlwaysOpen = yes;
   RemovableMedia = yes;
   RandomAccess = no;
   AutoChanger = yes;
   AutoSelect = yes;
}

Device {
   Name = L100-Drive-1
   Drive Index = 0
   Media Type = LTO-3
   Archive Device = /dev/L100-Drive-1
   AutomaticMount = yes;
   AlwaysOpen = yes;
   RemovableMedia = yes;
   RandomAccess = no;
   AutoChanger = yes;
   AutoSelect = yes;
}



thanks!
Stephen
-- 
Stephen Thompson               Berkeley Seismological Laboratory
stephen AT seismo.berkeley DOT edu    215 McCone Hall # 4760
404.538.7077 (phone)           University of California, Berkeley
510.643.5811 (fax)             Berkeley, CA 94720-4760

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