We fixed this with a firmware upgrade to the 9840 drives.

What caused our hangup was a media error which left a tape with a corrupt
header (MIR) so it would hang the entire drive next time.  It tries to
position and then never completes.

Hitting the reset button on the drive normally unlocked things but we had
to freeze the media until it's backups expired to stop it being written to.
Once expired you could write to the start of the tape which resets the MIR
and the tape is fine after that.

Ed





Dan Logcher <dlogcher AT MIT DOT EDU>@mailman.eng.auburn.edu on 21/04/2004
14:57:07

Sent by:    veritas-bu-admin AT mailman.eng.auburn DOT edu


To:    Veritas-bu AT mailman.eng.auburn DOT edu
cc:
Subject:    Re: [Veritas-bu] Stopping ltid


Ed.Toner AT eu.nabgroup DOT com wrote:

>
> We had something similar but it was avrd that was hung up. stopltid asks
> ltid to stop which in turns waits for it's children to stop. avrd and
acsd
> (if you use acsd) can get "stuck".
>
> If you have a network problem acsd can hang and if you have a drive
problem
> (particularly fibre channel drives) then avrd can get stuck. We would end
> up resetting the hung tape drive which allowed avrd to go which in turn
> released ltid.

This is exactally what happens here.  The Fibre channel gets hung, and we
cannot dismount the tape.  You can't kill ltid, because avrd is still
trying
to talk to the drive.  If you kill -9 and restart, avrd hangs trying to
verify the drives exist and it never changes them from AVR to ACS status..

I have to power cycle the drives to clear the problem.  I have noted the
fibre channel is hung from the switch side (I get amber light on the
switch).

--
Dan

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