[stgt] Bug report stgt vtl

[FUJITA Tomonori]

On Thu, 9 Apr 2009 10:11:57 +1000
Mark Harvey <markh794 at gmail.com> wrote:

> On Wed, Apr 8, 2009 at 7:51 PM, Albert Pauw <albert.pauw at gmail.com> wrote:
> > I may have found a glitch in the vtl code.
> >
> > Here's what I had:
> >
> > vtl configured with 8 tapes and 3 drives.
> >
> > I loaded a tape in the first drive
> >
> > mtx -f /dev/sg6 load 1 0
> >
> > Checked the status
> >
> > mtx -f /dev/sg6 status
> >
> > which showed the tape in the drive.
> > Now I write two tar images to it:
> >
> > tar cvzf /dev/nst0 /etc/bacula
> > tar cvzf /dev/nst0 /etc/iscsi
> >
> > (just example backups, not to big)
> >
> > I rewind the tape
> >
> > mt -f /dev/nst0 rewind
> >
> > And am able to read them both back:
> >
> > tar tvzf /dev/nst0
> > mt -f /dev/nst0 fsf
> > tar tvzf /dev/nst0
> >
> > Now I unload the tape:
> >
> > mtx -f /dev/sg6 unload 1 0
> OK, this should have fail.. In the real world, you can't eject a tape
> when it is NOT at BOT..

So, our code doesn't fail however we should fail here, right?


> 
> >
> > All working fine, now I load the tape in another tape drive (or the same
> > one, it doesn't matter):
> >
> > mtx -f /dev/sg6 load 1 1
> >
> > When I try to read the tar images immediately I get an error, however when I
> > rewind the tape first it works fine,
> > both images are there.
> >
> > The point I want to make is that there are differences in tape behaviour on
> > rewinding before eject.
> > As I configured the tapes as LTO type it should rewind before eject. A load
> > would always start
> > at the beginning. A DLT tape, through its very design, would stay at its
> > position. As the code is
> > at the moment, it always behave as the latter, its current position is at
> > the last state before eject.
> 
> The media file should have been closed at time of ejecting.
> 
> >
> > It would be nice to have the option of changing this behaviour.
> >
> > Albert
> >
> Many thanks for the bug reports.
> 
> Mark
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