On Thu, 13 Sep 2012 10:11:27 +0200
Carlo Filippetto <carlo.filippetto AT gmail DOT com> wrote:

[...]
> 13-set 07:02 bacula-sd JobId 11294: Ready to read from volume
> "V-weekly-0002" on device "DEV-nas" (/mnt/backup/backup).
> 13-set 07:02 bacula-sd JobId 11294: Forward spacing Volume
> "V-weekly-0002" to file:block 0:210.
> 13-set 07:05 bacula-sd JobId 11294: Error: block.c:319 Volume data
> error at 2:878168506!
> Block checksum mismatch in block=146766 len=61032: calc=801dc935
> blk=f00063ce 13-set 07:05 bacula-sd JobId 11294: Fatal error:
> fd_cmds.c:169 Command error with FD, hanging up.
[...]

Looks like you're backing up into file volumes, right?
Can you verify you don't have faulty disk hardware?

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