> 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;
> }
>

I do not have a good solution but I know by default bacula does not
want to load the same pool into more than 1 storage device at the same
time.

John

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