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Re: [Bacula-users] Device is BLOCKED

2015-04-24 11:04:32
Subject: Re: [Bacula-users] Device is BLOCKED
From: Josh Fisher <jfisher AT pvct DOT com>
To: bacula-users AT lists.sourceforge DOT net
Date: Fri, 24 Apr 2015 11:02:27 -0400 
On 4/24/2015 9:14 AM, Clark, Patricia A. wrote:
> This is a known bug that has been reported, but still exists.  The job wants 
> the tape in use by another job that is using it in drive 0.

I'm not convinced that this is a bug. By design, Bacula allows more than 
one job to simultaneously write to the same volume. When a job looks for 
the next volume to write on, it cannot exclude volumes that are already 
in use by another job. Note that this is not just at job start up, but 
any time a volume is needed. What causes the catch-22 is that each job 
is assigned a single device (tape drive) only once at job start up. If 
two jobs, each writing to a different device, require the same volume, 
then one job must wait until the volume can be moved into its assigned 
device. So it is not a bug in the implementation, but rather a design 
choice.

 From the perspective of using a multiple drive changer it would seem 
that it is a bug to allow multiple jobs to simultaneously write to the 
same volume, but Bacula must work with all kinds of hardware. If the 
implementation were changed to disallow simultaneous writes to the same 
volume, then concurrent jobs with a single drive changer would be 
impossible.

Bacula does allow resolving this issue through the use of pools. By 
segregating jobs that are to be run concurrently into different pools, 
the situation where two jobs want the same volume at the same time is 
avoided altogether.  So is this a bug, or is it a configuration error?


>    Your options are:
>
>    1.  Let it wait until the job(s) using the tape in drive 0 finishes.  The 
> pitfall here is if the tape becomes full.
>    2.  Cancel the job(s) requesting the tape in drive 1.  Don't restart the 
> job, but start a new job.  It may or may not decide to use a different tape.
>    3.  Cancel the job(s) using the tape in drive 0.  Bacula should move the 
> tape from drive 0 to drive 1 once all of the connections to the tape and 
> drive have been released.
>    4.  If, for some strange reason there are no jobs using the tape in drive 
> 0, try releasing drive 0 in bconsole – this will put the tape back into its 
> slot and Bacula should mount it for you.
>
> You may need to use a combination of #4 and one of the other options.  If 
> none of the above corrects the issue, you may need to restart both your 
> director and storage daemons and start again.
>
> Patti Clark
> Linux System Administrator
> R&D Systems Support Oak Ridge National Laboratory
>
> From: <More>, Ankush <ankush.more AT capgemini DOT com<mailto:ankush.more AT 
> capgemini DOT com>>
> Date: Friday, April 24, 2015 at 3:29 AM
> To: Radosław Korzeniewski <radoslaw AT korzeniewski DOT net<mailto:radoslaw 
> AT korzeniewski DOT net>>
> Cc: bacula-users <bacula-users AT lists.sourceforge DOT 
> net<mailto:bacula-users AT lists.sourceforge DOT net>>
> Subject: Re: [Bacula-users] Device is BLOCKED
>
> Hi ,
>
> Yes, I tried to mount from bconsole-->mount, but still  error is same.
> Appreciate if some can quickly help to resolve this issue.
>
> Device "Drive-1" (/dev/nst1) open but no Bacula volume is currently mounted.
>      Device is BLOCKED waiting for mount of volume "NY5039L4",
>         Pool:        Billable
>         Media type:  LTO-4
>      Slot 1 is loaded in drive 0.
>      Total Bytes Read=0 Blocks Read=0 Bytes/block=0
>      Positioned at File=0 Block=0
>
> Thank you,
> Ankush
> From: Radosław Korzeniewski [mailto:radoslaw AT korzeniewski DOT net]
> Sent: 23 April 2015 20:07
> To: More, Ankush
> Cc: bacula-users AT lists.sourceforge DOT net<mailto:bacula-users AT 
> lists.sourceforge DOT net>
> Subject: Re: [Bacula-users] Device is BLOCKED
>
> Hello,
>
> 2015-04-23 13:28 GMT+02:00 More, Ankush <ankush.more AT capgemini DOT 
> com<mailto:ankush.more AT capgemini DOT com>>:
> Hi Team,
>
> We have bacula 7.x with  tape auto-changer.
> I am getting below error in “status” and backup stop ( list jobs show as 
> running).
> I notice when I run   “/usr/libexec/bacula/mtx-changer”  tape  "NY5039L4" is 
> mounted in Drive.
>
>  From Bacula point of view mtx-changer can show you that a tape is loaded, 
> not mounted.
>
> Then why bacula show BLOCKED.
> How to resolve this issue?
>
> Bacula is asking you to mount a tape. Did you do this? You can mount a tape 
> with mount command in bconsole.
>
> Is there any parameter ?
>
> Device "Drive-1" (/dev/nst1) is waiting for:
>      Volume:      NY5216L4
>      Pool:        Billable
>      Media type:  LTO-4
>      Device is BLOCKED waiting for mount of volume "NY5039L4",
>         Pool:        Billable
>         Media type:  LTO-4
>      Slot 1 is loaded in drive 1.
>      Total Bytes Read=64,512 Blocks Read=1 Bytes/block=64,512
>      Positioned at File=0 Block=0
>
> Thank you,
> Ankush
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> --
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