This isn't a problem for me anymore, just something I wanted to document
on this mailing for others to see.
Back in november 2006, our company upgraded our Quantum AutoLoader to
the new Quantum SuperLoader 2 which uses SDLT-600 tapes. Ever since we
got this new unit, 25% of the newly purchased SDLT-600 tapes refused to
work with bacula. I tried replacing the AutoLoader 3 times, but the
problem persisted. Usually I was able to label all my new tapes, but
when it came time for bacula to actually write something to them, it
refused, saying the tape was in read-only, or that it didn't contain any
label (even though I had labelled the tape).
So after a while of just fooling around with the btape utility, I was
able to fix the "read-only" tapes. In order to get these tapes working,
I used the btape utility and I ran the rawfill command. It was the only
command that would work, bfill, test, fill, label, all wouldn't because
they complained the tape was in read-only (even though it wasn't). With
the rawfill command, I could see that shortly after starting the
command, rawfill would write to the tape, but 5 seconds into the
process, it seemed to freeze. And then all of the sudden, maybe after a
couple of minutes, the rawfill would continue. It seemed as if something
at the beginning of the tape was physically/mechanically blocking the
writing process and then all of the sudden, the tape continued.
After successfully running the rawfill command for about 5-10 minutes, I
would cancel it, and at that point I was able to run the test and label
commands successfully. After running a rawfill, then a test and finally
the label command, I was able to restart using these "read-only" tapes
to actually save some backups onto it.
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