Hello all,
I've had the following problem for ages (meaning multiple major
revisions of bacula) and I've seen this come up from time to time on the
mailing list, but I've never actually seen a resolution (please point me
to one if it's been found).
background:
I run monthly Fulls and nightly Incrementals. I have a 2 drive
autochanger dedicated to my Incrementals. I launch something like ~150
Incremental jobs each night. I am configured for 8 concurrent jobs on
the Storage Daemon.
PROBLEM:
The first job(s) grab one of the 2 devices available in the changer
(which is set to AutoSelect) and either load a tape, or use a tape from
the previous evening. All tapes in the changer are in the same
Incremenal-Pool.
The second jobs(s) grab the other of the 2 devices available in the
changer, but want to use the same tape that's just been mounted (or put
into use) on the jobs that got launched first. They will often literal
wait the entire evening until 100's of jobs run through on only one
device, until that tape is freed up, at which point it is unmounted from
the first device and moved to the second.
Note, the behaviour seems to be to round-robin my 8 concurrency limit
between the 2 available drives, which mean 4 jobs will run, and 4 jobs
will block on waiting for the wanted Volume. When the original 4 jobs
are completed (not at the same time) additional jobs are launched that
keep that wanted Volume in use.
LOG:
03-Nov 22:00 DIRECTOR JobId 267433: Start Backup JobId 267433, Job=JOB.
2012-11-03_22.00.00_0403-Nov 22:00 DIRECTOR JobId 267433: Using Device
"L100-Drive-0"03-Nov 22:00 DIRECTOR JobId 267433: Sending Accurate
information.
03-Nov 22:00 sd_L100_ JobId 267433: 3307 Issuing autochanger "unload
slot 82, drive 0" command.
03-Nov 22:06 lawson-sd_L100_ JobId 267433: Warning: Volume "IM0108"
wanted on "L100-Drive-0" (/dev/L100-Drive-0) is in use by device
"L100-Drive-1" (/dev/L100-Drive-1)
03-Nov 22:09 sd_L100_ JobId 267433: Warning: Volume "IM0108" wanted on
"L100-Drive-0" (/dev/L100-Drive-0) is in use by device "L100-Drive-1"
(/dev/L100-Drive-1)
03-Nov 22:09 sd_L100_ JobId 267433: Warning: mount.c:217 Open device
"L100-Drive-0" (/dev/L100-Drive-0) Volume "IM0108" failed: ERR=dev.c:513
Unable to open device "L100-Drive-0" (/dev/L100-Drive-0): ERR=No medium
found
.
.
.
CONFIGS (partial and seem pretty straight-forward):
Schedule {
Name = "DefaultSchedule"
Run = Level=Incremental sat-thu at 22:00
Run = Level=Differential fri at 22:00
}
JobDefs {
Name = "DefaultJob"
Type = Backup
Level = Full
Schedule = "DefaultSchedule"
Incremental Backup Pool = Incremental-Pool
Differential Backup Pool = Incremental-Pool
}
Pool {
Name = Incremental-Pool
Pool Type = Backup
Storage = L100-changer
}
Storage {
Name = L100-changer
Device = L100-changer
Media Type = LTO-3
Autochanger = yes
Maximum Concurrent Jobs = 8
}
Autochanger {
Name = L100-changer
Device = L100-Drive-0
Device = L100-Drive-1
Changer Device = /dev/L100-changer
}
Device {
Name = L100-Drive-0
Drive Index = 0
Media Type = LTO-3
Archive Device = /dev/L100-Drive-0
AutomaticMount = yes;
AlwaysOpen = yes;
RemovableMedia = yes;
RandomAccess = no;
AutoChanger = yes;
AutoSelect = yes;
}
Device {
Name = L100-Drive-1
Drive Index = 0
Media Type = LTO-3
Archive Device = /dev/L100-Drive-1
AutomaticMount = yes;
AlwaysOpen = yes;
RemovableMedia = yes;
RandomAccess = no;
AutoChanger = yes;
AutoSelect = yes;
}
thanks!
Stephen
--
Stephen Thompson Berkeley Seismological Laboratory
step...@seismo.berkeley.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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