Re: [Bacula-users] Deadlock

Martin Aherron wrote:
> Ran across an interesting deadlock situation that I can't explain.
> This is a configuration that has been working reliably for months.

I see this fairly regularly (about once a month) too.

I have no idea why bacula demands that a tape which is already mounted 
in one drive be mounted in another. Some better sanity checking wouldn't 
go amiss. :-)

(In my setup any pool can be mounted on any drive. This is most likely 
the default setup for most installations)


> excerpt from status command:
> 
> Device status:
> Autochanger "Overland Neo" with devices:
>    "ULTRIUM-TD1-1" (/dev/nvdrive_1)
>    "ULTRIUM-TD1-2" (/dev/nvdrive_2)
>    "ULTRIUM-TD1-3" (/dev/nvdrive_3)
>    "ULTRIUM-TD1-4" (/dev/nvdrive_4)
> Device "ULTRIUM-TD1-1" (/dev/nvdrive_1) is mounted with:
>     Volume:      Tape_20_52
>     Pool:        Pool_1
>     Media type:  Ultrium-1
>     Slot 9 is loaded in drive 0.
>     Total Bytes=15,525,328,896 Blocks=240,657 Bytes/block=64,512
>     Positioned at File=97 Block=0
> Device "ULTRIUM-TD1-2" (/dev/nvdrive_2) is mounted with:
>     Volume:      CTape_50_10
>     Pool:        Pool_2
>     Media type:  Ultrium-1
>     Device is BLOCKED waiting for mount of volume "CTape_50_9",
>        Pool:        Pool_2
>        Media type:  Ultrium-1
>     Slot 83 is loaded in drive 1.
>     Total Bytes Read=64,512 Blocks Read=1 Bytes/block=64,512
>     Positioned at File=0 Block=0
> Device "ULTRIUM-TD1-3" (/dev/nvdrive_3) is mounted with:
>     Volume:      CTape_50_9
>     Pool:        Pool_3
>     Media type:  Ultrium-1
>     Device is BLOCKED waiting for mount of volume "CTape_50_10",
>        Pool:        Pool_3
>        Media type:  Ultrium-1
>     Slot 10 is loaded in drive 2.
>     Total Bytes Read=64,512 Blocks Read=1 Bytes/block=64,512
>     Positioned at File=0 Block=0
> 
> 
> Running Jobs:
> Writing: Incremental Backup job Enterprise JobId=3401 Volume="CTape_50_9"
>     pool="Pool_2" device="ULTRIUM-TD1-2" (/dev/nvdrive_2)
>     spooling=0 despooling=0 despool_wait=0
>     Files=0 Bytes=0 Bytes/sec=0
>     FDReadSeqNo=6 in_msg=6 out_msg=4 fd=13
> Writing: Full Backup job SalesDB JobId=3402 Volume="CTape_50_10"
>     pool="Pool_3" device="ULTRIUM-TD1-3" (/dev/nvdrive_3)
>     spooling=0 despooling=0 despool_wait=0
>     Files=0 Bytes=0 Bytes/sec=0
>     FDReadSeqNo=6 in_msg=6 out_msg=4 fd=12
> ====
> 
> 
> excerpt from list volumes:
> 
> 
> Pool: Pool_2
> +---------+------------+-----------+---------+---------------+----------+--------------+---------+------+-----------+-----------+---------------------+
>  
> 
> | mediaid | volumename | volstatus | enabled | volbytes      | volfiles 
> | volretention | recycle | slot | inchanger | mediatype | 
> lastwritten         |
> +---------+------------+-----------+---------+---------------+----------+--------------+---------+------+-----------+-----------+---------------------+
>  
> 
> |     135 | CTape_50_9 | Append    |       1 | 9,490,618,368 |       37 
> |    5,184,000 |       1 |   83 |         1 | Ultrium-1 | 2011-09-07 
> 02:06:12 |
> +---------+------------+-----------+---------+---------------+----------+--------------+---------+------+-----------+-----------+---------------------+
>  
> 
> Pool: Pool_3
> +---------+-------------+-----------+---------+----------------+----------+--------------+---------+------+-----------+-----------+---------------------+
>  
> 
> | mediaid | volumename  | volstatus | enabled | volbytes       | 
> volfiles | volretention | recycle | slot | inchanger | mediatype | 
> lastwritten         |
> +---------+-------------+-----------+---------+----------------+----------+--------------+---------+------+-----------+-----------+---------------------+
>  
> 
> |     136 | CTape_50_10 | Append    |       1 | 38,421,218,304 |       
> 41 |    5,184,000 |       1 |   10 |         1 | Ultrium-1 | 2011-09-07 
> 02:06:17 |
> +---------+-------------+-----------+---------+----------------+----------+--------------+---------+------+-----------+-----------+---------------------+
>  
> 
> 
> 
> Notice that two devices assigned to two different jobs using two 
> different pools are blocking each other.
> Anyone have any insight?
> 
> Thanks.
> 
> Martin
> 
> 
> 
> 
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