Dear Stephen Thompson,

In message <50982F94.10701 AT seismo.berkeley DOT edu> you wrote:
> On 11/05/2012 01:17 PM, Josh Fisher wrote:
> >
> > On 11/5/2012 11:03 AM, Stephen Thompson wrote:
...
> > When you start the jobs manually, I assume you are starting them at
> > different times. This works, because the first job is up and running
> > with the volume loaded before the second job begins its selection
> > process. One way to handle this issue is to have a different Schedule
> > for each job and start the jobs at different times with one second
> > spacing. Jobs will still run concurrently, they just won't start up
> > concurrently.
> 
> I suspected something like that, but would ask out loud "if bacula runs 
> into a contention like that and there are other available volumes in the 
> requested pool, why doesn't it decide to use another volume instead of 
> blocking?"

I'm not sure about this.  I see very similar problems when trying to
use the second drive for other purposes, like labelling new tapes,
while a job is running on the first one, like this:

*label dummy pool=ARCH storage=LTOLIB drive=1 slots=25 barcodes
Connecting to Storage daemon LTOLIB at ltos.denx.de:9103 ...
3306 Issuing autochanger "slots" command.
Device "LTO3-0" has 48 slots.
Connecting to Storage daemon LTOLIB at ltos.denx.de:9103 ...
3306 Issuing autochanger "list" command.
The following Volumes will be labeled:
Slot  Volume
==============
  25  SAV000L3
Do you want to label these Volumes? (yes|no): yes
Connecting to Storage daemon LTOLIB at ltos.denx.de:9103 ...
Sending label command for Volume "SAV000L3" Slot 25 ...
3937 Device ""LTO3-0" (/dev/tape/by-id/scsi-35000e11802947001-nst)" is busy 
with writers=1 reserved=0.
Label command failed for Volume SAV000L3.

with:

Device {
  Name = LTO3-0
  Media Type = LTO-3
  Archive Device = /dev/tape/by-id/scsi-35000e11802947001-nst
  AutomaticMount = yes;               # when device opened, read it
  AlwaysOpen = yes;
  RemovableMedia = yes;
  RandomAccess = no;
  Maximum File Size = 5GB
  Maximum Block Size = 512K
  Changer Command = "/usr/libexec/bacula/mtx-changer %c %o %S %a %d"
  Changer Device = /dev/tape/by-id/scsi-1BDT_FlexStor_II_00DE64100465_LL0
  AutoChanger = yes
  # Enable the Alert command only if you have the mtx package loaded
  Alert Command = "sh -c 'tapeinfo -f %c |grep TapeAlert|cat'"
# If you have smartctl, enable this, it has more info than tapeinfo 
# Alert Command = "sh -c 'smartctl -H -l error %c'"  
  # Spool Data to disk before writing to tape
  Spool Directory = /backup/spool
  Maximum Spool Size = 5120GB
  Maximum Job Spool Size = 5120GB
}

Device {
  Name = LTO3-1
  Media Type = LTO-3
  Archive Device = /dev/tape/by-id/scsi-35000e11802947004-nst
  AutomaticMount = yes;               # when device opened, read it
  AlwaysOpen = yes;
  RemovableMedia = yes;
  RandomAccess = no;
  Maximum File Size = 5GB
  Maximum Block Size = 512K
  Changer Command = "/usr/libexec/bacula/mtx-changer %c %o %S %a %d"
  Changer Device = /dev/tape/by-id/scsi-1BDT_FlexStor_II_00DE64100465_LL0
  AutoChanger = yes
  # Enable the Alert command only if you have the mtx package loaded
# Alert Command = "sh -c 'tapeinfo -f %c |grep TapeAlert|cat'"
# If you have smartctl, enable this, it has more info than tapeinfo 
  Alert Command = "sh -c 'smartctl -H -l error %c'"  
  # Spool Data to disk before writing to tape
  Spool Directory = /backup/spool
  Maximum Spool Size = 5120GB
  Maximum Job Spool Size = 5120GB
}


Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd AT denx DOT de
Drawing on my fine command of language, I said nothing.

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