On Thu, 21 Sep 2006, Dan Langille wrote:

> On 21 Sep 2006 at 10:08, Sarath Jayewardena wrote:
> 
> > Hi,
> > 
> > I am experimenting to see whether bacula would be a good system for me to
> > backup our department's servers. I am running bacula director and storage
> > daemon on a Debian (sarge) machine which has a scsi DLT tape drive
> > attached to it. The version of bacula is 1.36.2. It looks promising,
> > except for one annoying, and in my view, serious problem:
> > 
> > The tape drive allows me to eject the tape by pressing an 'unload'
> > button. However, afterwards, when I re-insert the tape, bacula cannot
> > read it, so all the backup data is useless. (Of course, if I have
> > 'unmounted' the tape from within bconsole before ejecting, bacula has
> > no problem accessing the data afterwards.) The question is, is there
> > any way to make bacula accept the tape if the tape was accidientally,
> > 'improperly' ejected? 
> >
> > I have browsed the mailing list archive and seen the advice that I
> > could use AlwaysOpen = no and OfflineOnUnmount = yes to guarantee that
> > bacula unmounts the tape after each backup. But the advice comes with
> > the warning that for each backup bacula will be rewinding and
> > re-positioning the tape consuming a lot of time, so leaving the
> > default behaviour is really preferred. 
> > 
> > If someone knows that this problem does not exist in newer versions of
> > bacula, I could upgrade to the version (1.38.11) in the Debian testing
> > distribution.
> 
> My tape drive does not allow me to eject the tape if Bacula has the 
> device. I think the key directive from my SD config is:
> 
> Offline on Unmount = yes
> 
> I do not specify AlwaysOpen, but that defaults to Yes.
> 
> What is wrong with unmounting withing bconsole before ejecting the 
> tape?
> 
There is really nothing wrong with unmounting within bconsole. My problem
arises when you *accidentally* eject the tape without unmounting. In my
environment, this can easily happen, because we have some tape drives
where we just eject the old tape and insert a new one for the nightly
backup (not using bacula).

I haven't tried the OfflineOnUnmount = yes yet. But my understanding is
that it would automatically unmount the tape after the backup (thus
causing it to to the time-consuming rewinding and re-positioning).

- Sarath


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