Bacula-users

Re: [Bacula-users] Tape drive contention?

2012-08-03 04:27:46
Subject: Re: [Bacula-users] Tape drive contention?
From: Alan Brown <ajb2 AT mssl.ucl.ac DOT uk>
To: Erich Weiler <weiler AT soe.ucsc DOT edu>
Date: Fri, 03 Aug 2012 09:24:44 +0100
On 02/08/12 21:03, Erich Weiler wrote:
> Hi Y'all,
>
> No one responded to this, but I'm hoping it's a common problem...  Once
> a library fills up and the job pauses while waiting for more tapes to be
> labeled, how does one "label barcodes" after refilling the library with
> new tapes without the library trying to run a backup job on the same
> tape drive, causing the job to fail (details below)?

One doesn't.

If they're new tapes, then using the "add" command will put them in the 
database and bacula will label each tape as it loads it, then discovers 
it's blank.

Older tapes will be relabelled as they're recycled.



> Many thanks!
> -erich
>
> On 07/24/12 20:57, Erich Weiler wrote:
>> Hi Y'all,
>>
>> We're running bacula 5.0.0 on CentOS 6. Been working just fine until
>> recently we saw a weird glitch.
>>
>> We have a Dell ML6000 tape library (with two tape drives) that holds 39
>> LTO-5 tapes. We're backing up hundreds of terabytes of static data in a
>> series of 10TB "Full" jobs.
>>
>> I loaded up all the tapes into the library then ran "label barcodes",
>> added them to the "Tape" pool, via drive #0, which worked great. Then we
>> started the backups jobs.
>>
>> Each job has been completing successfully and things have been OK for
>> about 10 days, then finally the all the tapes in the tape library filled
>> up. We got the "Intervention Required" email saying no volumes were
>> available, that we needed to add more volumes to the "Tape" pool in
>> order for the current job to continue. So we unloaded all the tapes from
>> the library, waited for the library robot to read all the barcodes, then
>> waited. Nothing happened after that. So I decided I probably needed to
>> "label barcodes" again to add the 39 new volumes to the "Tape" pool.
>>
>> So, I ran "label barcodes" on drive 0 to the "Tape" pool. Note that
>> drive 0 was the drive in use for the backup jobs from before. It seemed
>> to load and label like 4 tapes and then all of a sudden I get this error
>> message saying something about "dev_in_use()" (sorry, lost the exact
>> message). I then noticed that bacula-sd had crashed and was no longer
>> running, and the job had failed.
>>
>> What I *think* happened in that the "label barcodes" command had labeled
>> a couple tapes, then bacula tried to use one to continue the job, but
>> the drive was busy labeling tapes (and thus could not continue the
>> backup) and bacula got confused and aborted. Could that be true?
>>
>> I then ran "label barcodes" again, this time choosing drive #1 when it
>> asked. Then began a new job, which seemed to automatically pick drive #1
>> to run the job on, and not drive #0.
>>
>> So I have a couple questions:
>>
>> 1: When I ran the "label barcodes" command on the new batch of tapes,
>> should I have run it from drive #1, since the job was thinking it should
>> use drive #0? Such that it could load the tape into drive #0 while drive
>> #1 could continue labeling tapes?
>>
>> 2: How does bacula know which drive to use to run a job? Does it
>> remember which drive labeled the tape, and automatically use that drive?
>>
>> 3: Any other way to safely label new tapes (while a job is paused)
>> without getting in the way of the job automatically trying to continue
>> once a few tapes are labeled?
>>
>> Thanks for any insight!
>>
>> cheers,
>> erich
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