[Bacula-users] Slow spooling

[Keith E. <ka...@mi...>]

We're seeing very slow spooling from a locally-attached disk:

12-Jun 10:31 rodney-sd JobId 179: User specified spool size reached.
12-Jun 10:44 rodney-sd JobId 179: Spooling data again ...
12-Jun 15:11 rodney-sd JobId 179: User specified spool size reached.
12-Jun 15:23 rodney-sd JobId 179: Spooling data again ...
12-Jun 19:59 rodney-sd JobId 179: User specified spool size reached.
12-Jun 20:12 rodney-sd JobId 179: Spooling data again ...
12-Jun 23:33 rodney-sd JobId 179: User specified spool size reached.
12-Jun 23:46 rodney-sd JobId 179: Spooling data again ...

The spool size is set to 40Gb, so the above shows around 12-13 minutes to
despool 40Gb to tape (sounds reasonable: tape is LT04), but between about
3.5hrs and 4.5hrs to copy the data to the spooling area.

Both the spooling area and and source disk are locally mounted SCSI disks.
No other Bacula jobs are running. A manual copy of data from the source
disk to the spooling area seems not unreasonably slow: 11G copied in 5m15s,
which would suggest that the 40Gb spool size should be copied in around 19
minutes.

I fully accept that this slow spooling may be due to factors other than
Bacula, but given that manual copy is running around 10-12 faster than the
Bacula spool, I was wondering if there are any known issues with Bacula
spooling? (Also grateful for other suggestions or tests we can run).

Bacula version 2.4.4

Thanks,
Keith