>>>>> On Thu, 01 Feb 2007 14:50:10 +0100, Erik P Olsen said:
> 
> Maybe I did something really stupid. I ejected an already bacula-mounted tape 
> and inserted a cleaning cartridge. After the cleaning process was finished I 
> reinserted the backup tape. I did it without an unmount/mount cycle. When the 
> backup run later started the tape was ejected with tape error and it was no 
> longer possible to read the tape because bacula claimed that it had no volume 
> label and that proved to be true when I tried to read the tape.
> 
> Why was this proceedue not possible and why was the backup tape overwritten?

It was overwritten because Bacula remembers the tape's position while it is
bacula-mounted.  When you ejected the tape, it was rewound without Bacula
knowing, so the position was different when you reinserted it.

Normally, when you bacula-mount a tape, Bacula knows that the tape is
positioned at the start, so it winds the taoe forward to the end before
writing the next job.


>                                                                              
> Is 
> it a bug or did I just do something stupid?

Do you have AlwaysOpen = yes (the default)in the device config?  If so, then I
think the bug is in the OS or tape drive -- it should be impossible to eject
the tape while it is mounted (and open) by Bacula.

__Martin

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