Hello,
On 2/14/2006 9:47 AM, Kai Matla wrote:
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?
You have to re-initialize the tapes in the new drive.
What I would suggest: When a tape is purged, you manually load it into
the drive. The following depends on your drive or library: If you don't
have to work on many tapes, use your libraries operator panel to select
the function to "format" the tape. Or use mt with the just loaded tape
(the tape must not be read from, written to or positioned, usually!) to
set the correct format. mt setdensity is the command you need with most
mt versions I know. The density code can be found by looking at a
DLT8000 tape with mt status beforehand, by the way.
After that, you write some stuff to the tape to make sure the drive can
later recognize the format. I usually do somethng like 'dd
if=/dev/urandom of=/dev/stx bs=16384 count=1024; mt -f /dev/nstx weof;
mt weof'. Following that, you can use btape to re-label the tape with
the prior volme name if you want to keep the existing names.
Arno
Thanks a lot,
Kai
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