[Bacula-users] incorrect "User specified spool size reached" message

I'm running Bacula 3.0.2 to back up a dozen of Linux servers
and a few Windows ones. Recently, messages like this started
showing up in the backup logs:

04-Jan 22:10 vm-backup-sd JobId 11043: Spooling data ...
04-Jan 22:11 vm-backup-sd JobId 11043: User specified spool size reached.
04-Jan 22:11 vm-backup-sd JobId 11043: Writing spooled data to Volume. 
Despooling 16,001,952 bytes ...
04-Jan 22:11 vm-backup-sd JobId 11043: Despooling elapsed time = 00:00:01, 
Transfer rate = 16.00 M bytes/second
04-Jan 22:11 vm-backup-sd JobId 11043: Spooling data again ...
04-Jan 22:11 vm-backup-sd JobId 11043: User specified spool size reached.
04-Jan 22:11 vm-backup-sd JobId 11043: Writing spooled data to Volume. 
Despooling 16,001,952 bytes ...
04-Jan 22:11 vm-backup-sd JobId 11043: Despooling elapsed time = 00:00:01, 
Transfer rate = 16.00 M bytes/second
04-Jan 22:11 vm-backup-sd JobId 11043: Spooling data again ...

The number of despooled bytes stays around the same during one
backup run (all jobs of one day) but decreases substantially
from one day to the next. For example:

03-Jan 22:29 vm-backup-sd JobId 11028: User specified spool size reached.
03-Jan 22:29 vm-backup-sd JobId 11028: Writing spooled data to Volume. 
Despooling 364,044,395 bytes ...
03-Jan 22:29 vm-backup-sd JobId 11028: Despooling elapsed time = 00:00:24, 
Transfer rate = 15.16 M bytes/second
03-Jan 22:29 vm-backup-sd JobId 11028: Spooling data again ...

My storage configuration looks like this:

Device {
  Name = LTO1
  Media Type = LTO1
  Archive Device = /dev/nst0
  AutomaticMount = yes;               # when device opened, read it
# OfflineOnUnmount = yes;             # when unmounted, eject tape
  AlwaysOpen = yes;
  RemovableMedia = yes;
  RandomAccess = no;
  SpoolDirectory = /home/backup/spool;
  MaximumSpoolSize = 50G;
}

So, taken literally, that message is just plain wrong. The 16 MB
spooled are far less than my specified spool size of 50 GB.

I checked the spool directory for stale files, and it is empty.
The filesystem it resides on has 98 GB of free space.
There are no concurrent jobs. ("Maximum Concurrent Jobs = 1")

What other possible reasons are there for that message?

TIA,
Tilman

-- 
Tilman Schmidt
Phoenix Software GmbH
Bonn, Germany

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