We're seeing this with a lot more frequency, though we've changed no
configuration. Jobs are often left waiting an entire run in order to
use a volume that's in use by the other drive within a 2 drive changer.
Stephen
On 7/25/12 7:38 AM, Stephen Thompson wrote:
>
> Hey all,
>
> I've been meaning to post about this for awhile, but it comes up pretty
> rarely (maybe once every few months running hundreds of job a night).
>
> With an autochanger with 2 drives, each set to AutoSelect, it's possible
> for bacula to want the same volume in both drives at the same time,
> which creates an Operator Intervention situation.
>
> Here's an example where apparently previous jobs were using a particular
> volume in one drive and somehow jobs assigned to the other drives wanted
> the exact same volume, causing them to pause and require operator
> intervention.
>
>
> sd_C4 Version: 5.2.10 (28 June 2012) x86_64-unknown-linux-gnu redhat
> Enterprise release
> Daemon started 23-Jul-12 10:13. Jobs: run=295, running=3.
> Heap: heap=135,168 smbytes=2,089,365 max_bytes=3,689,580 bufs=299
> max_bufs=396
> Sizes: boffset_t=8 size_t=8 int32_t=4 int64_t=8 mode=0,0
>
> Running Jobs:
> Writing: Incremental Backup job AAA JobId=247971 Volume="IM0081"
> pool="Incremental-Pool" device="C4-Drive-0" (/dev/C4-Drive-0)
> spooling=0 despooling=0 despool_wait=0
> Files=0 Bytes=0 Bytes/sec=0
> FDReadSeqNo=6 in_msg=6 out_msg=4 fd=9
> Writing: Incremental Backup job BBB JobId=247973 Volume="IM0081"
> pool="Incremental-Pool" device="C4-Drive-0" (/dev/C4-Drive-0)
> 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: Incremental Backup job CCC JobId=247975 Volume="IM0081"
> pool="Incremental-Pool" device="C4-Drive-0" (/dev/C4-Drive-0)
> spooling=0 despooling=0 despool_wait=0
> Files=0 Bytes=0 Bytes/sec=0
> FDReadSeqNo=6 in_msg=6 out_msg=4 fd=15
> Writing: Incremental Backup job DDD JobId=247976 Volume="IM0081"
> pool="Incremental-Pool" device="C4-Drive-0" (/dev/C4-Drive-0)
> spooling=0 despooling=0 despool_wait=0
> Files=0 Bytes=0 Bytes/sec=0
> FDReadSeqNo=6 in_msg=6 out_msg=4 fd=18
> ====
>
> Jobs waiting to reserve a drive:
> ====
>
> Terminated Jobs:
> JobId Level Files Bytes Status Finished Name
> ===================================================================
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
> ====
>
> Device status:
> Autochanger "C4-changer" with devices:
> "C4-Drive-0" (/dev/C4-Drive-0)
> "C4-Drive-1" (/dev/C4-Drive-1)
> Device "C4-Drive-0" (/dev/C4-Drive-0) is not open.
> Device is BLOCKED waiting for mount of volume "IM0081",
> Pool: Incremental-Pool
> Media type: LTO-3
> Drive 0 is not loaded.
> Device "C4-Drive-1" (/dev/C4-Drive-1) is mounted with:
> Volume: IM0081
> Pool: Incremental-Pool
> Media type: LTO-3
> Slot 32 is loaded in drive 1.
> Total Bytes=369,270,534,144 Blocks=1,408,808 Bytes/block=262,115
> Positioned at File=203 Block=0
> ====
>
> Used Volume status:
> IM0070 on device "C4-Drive-1" (/dev/C4-Drive-1)
> Reader=0 writers=0 devres=0 volinuse=0
> IM0081 on device "C4-Drive-0" (/dev/C4-Drive-0)
> Reader=0 writers=0 devres=4 volinuse=0
> ====
>
>
>
> Anyone else have this happen?
> Race condition?
>
> 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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