Hi all,
> > I got a little problem. We had a DLT4000 Lib and
used
> > several tapes to backup data. Now we upgraded the
lib
> > to DLT8000 and want to use the same tapes (DLT
IV).
> > The backup works fine with old an new tapes, but
the
> > old ones (formated with the DLT4000 drive) are
used as
> > DLT4000. The drive just packs half the data on
them
> > compared to a completly new tape and it takes the
same
> > time as before on DLT4000.
> >
> > I tried to find an option in Bacula, at the lib or
in
> > mt. But with all tries it would only erase the
data on
> > the tape and not the format.
> > How can I format the old DLT4000 tapes to DLT8000?
>
>
> This isn't a Bacula option. It's a tape drive
option.
>
> When you put the tape into the drive, the drive
tries to determine
> the density already on the tape. It likes to keep
it the same as the
> exsiting tape. What you need to do is tell the
drive to do something
> else.
>
> I've never tried it. On the panel of your DLT
drive, there should be
> a button to set the density and override the setting
that it found.
> Try that. Let us know.
I tried to do it at the Library/Drive, but with no
success, so I worked my way to a solution with mt.
Hope it helps others, but no guarantee..
1. "umount Tape" in Bacula
2. load the old (DLT4000) tape in the drive
3. look at the status: # mt -f /dev/nst0 status (nst0
is my drive, my result is "Density code 0x83 (DLTtape
IV 4000 compressed (40GB))" or "Density code 0x1a
(DLTtape IV (81633 bpi))")
4. set the new density: # mt -f /dev/nst0 setdensity
0x89 ("0x89" for DLT8000)
5. rewind the tape: # mt -f /dev/nst0 rewind
6. write End of File: # mt -f /dev/nst0 weof
7. check status: # mt -f /dev/nst0 status (my result
is "Density code 0x89 (DLTtape IV 8000 compressed
(80GB))")
8. delete tape in Bacula
9. label tape in Bacula (same name as before is
possible)
10. don´t forget to update the volume information in
Bacula about the slot the tape came from, in case you
have a library, since Bacula lost that info when
deleting the old tape
Maybe some of these steps are obsolete, but it worked
that way for me.
Thanks for the tips that got me in the right
direction.
Bye,
Kai
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