Good afternoon, Brian.

I seem to remember Compaq/HP coming out with a newer HBA driver (version
4.81a9) that addresses an issue with the ResetTRPLO registry setting,
which had something to do with SCSI BUS resets when a server was
rebooted.  This assumes that you are using Compaq/HP branded HBA's on
your servers, and it also assumes you are using Fibre Channel SWITCHES
and not HUBS.  If you are using the latter, the answer is simple--HUBS
cause LIPS (Loop Initialization Primitives) which interrupt the fabric
and cause nastiness.

Hope something here is useful.

Brian

-----Original Message-----
From: Narkinsky, Brian [mailto:Brian.Narkinsky AT DEP.STATE.FL DOT US] 
Sent: Monday, November 18, 2002 3:07 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] Storageworks MDR Configuration

I seem to be having problems with my Networker system whenever a member
of
the SAN is rebooted.  My COnsiste of a Networker Server on W2K, A
cluster
hosting Exchange 2000, and a TL895 with 7 DLT 7000 drives connected via
an
MDR.

All Servers see all the tape drives.  I am using autochanger sharing and
storage nodes to assign two drives to each cluster node and the other
three
are on the backup server for network backups etc.

What happens is that anytime a member of the cluster is rebooted
Networker
gets really confused.  Tapes won't mount.  Sometimes they do but never
really
do.  You can't unmount etc.  Sometimes they demand to clean the drives.
Sometimes I get "No Media in Drive" errors.  What fixes it is a reboot
of the
Tape Library and the MDR.  These errors all seem like what Legato says
will
happen if you the tape drives logical names out of order.  However if
you try
to reorder them things work for a while and then get worse over time.

I think what is happening is that for some reason the tape drives are
being
seen by W2K in a different order after the reboot.  

Does this sound familiar to anybody.  Anybody no a fix.  I am starting
to try
to wade through the MDR documentation but decided to check here first.

Thanks,
Brian

Brian Narkinsky
System Manager
Department of Environmental Protection
MS 6520
2600 Blairstone RD
Tallahassee, FL 32399
phone (850)245-8314
fax (850)412-0400
 

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