David
We have had similar problem with one of our customers with very similar
environment (ATL p7000 library with SDLT drives attached to AIX server
via fiber bridge and switch.)
Following ATL suggestion we changed "AUTO_UNLOAD_ENABLE" parameter to
"yes" and it helped us to avoid unload problems.
This ATL library parameter force robot to perform unload command every
time the robot is performing move cartridge from the drive.
Check with ATL if this parameter is applicable in your case.

-----Original Message-----
From: David A. Chapa [mailto:david AT datastaff DOT com] 
Sent: Wednesday, January 08, 2003 9:49 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] AIX/Quantum/Fibre
Importance: High


        Customer has an F80 AIX system running 4.3.3 with all patches.
This system
has 2 IBM 6228 fiber cards in it and they are attached to a McData 24
port
switch and then they have a P3000 8 drive DLT robotic unit attached to
the
switch via fiber.  Their issue is that 50% of the time we can
mount/unmount
tapes from the drives with no issues and backups run fine BUT the other
50%
of time the tape does not get unmounted and therefore the move command
cannot find the tape in the drive and the drive goes down.  IBM stated
that
this is an Quantum P3000 fiber brigde issue and not their problem.
Quantum
has stated that the fiber cards we are utilizing are the issue.  Quantum
is
working on this issue via firmware upgrades but have not produced a
solution
yet.

The above was the info I receive from my customer.

Additionally, IBM told them that the OS has a pseek routine that queries
the
drives to see if they are available.  Quantum's Fibre bridges has this
already built-in, so apparently the thoughts are that the repeated pseek
is
overloading the fibre bridge causing it to reset.

Any one see this before?  Is there a temporary WORKAROUND?

Thanks

David


<><><><><><><><><><><><><><><><><><><><>
David A. Chapa
Backup Storage Consultant
DataStaff, Inc.
http://www.datastaff.com
312 683 1144
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