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Date:      Fri, 19 Jun 1998 08:34:24 -0400 (EDT)
From:      Cliff Addy <fbsdlist@federation.addy.com>
To:        questions@FreeBSD.ORG
Subject:   Weird reboot problem
Message-ID:  <Pine.BSF.3.95q.980619082031.7095A-100000@federation.addy.com>

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I'm having a really strange problem with servers spontaneously rebooting.
This is a fairly recent problem, the last week or so on servers that have
run fine for months and months.  The only thing I can find is a log entry
right before the reboot:

  /kernel: st0(ahc0:1:0): Sequential-Access density code 0x13, drive empty

It *looks* like an attempt to backup to tape, but no backups are being
run.  I even had the backup script (run out of cron) log attempts before
beginning the backup, thinking that our scheduling system was out of
whack.  Nothing appeared.

The only thing I can think of is that we recently stopped keeping tapes in
the drive overnight, we used to pop out the day's tapes and pop in the
next day's right away.  Does FreeBSD, for some reason, occasionally check
the tape drives?



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