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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