We use Dual ported HBAs, one port for tape one port for disk, our library
and disk array vendoe suggested this configuration. We also use Veritas DMP
with these hosts and it works fine


Message: 1
Date: Tue, 10 Aug 2004 10:59:13 +0100
From: "Paul Esson" <paul.esson AT redstor DOT com>
To: <veritas-bu AT mailman.eng.auburn DOT edu>
Subject: [Veritas-bu] Tape SANs and dedicated HBAs

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Folks,
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I would like to know from fellow subscribers how many folks are using
dedicated HBAs for tape versus shared HBAs for disk and tape in SAN
environments.  I am being told by a major library vendor that despite
having dual HBAs in hosts for redundant disk access, I need to install
additional HBAs to access their libraries.  They are suggesting two main
issues:
=20

*          Conflicting requirements in HBA set-up for disk and tape
*          Potential conflict with multipathing/failover software

My proposal would not present multiple paths to a tape drive and my
understanding of the failover software we are proposing to use is that
it is disk specific and would not failover all I/O from one HBA to the
other.
=20
All comments appreciated.
=20
Regards,
=20

Paul Esson
Senior Support Engineer
Redstor Limited

Direct:         +44 (0) 1224 595381
Mobile:         +44 (0) 7766 906514
E-Mail:         paul.esson AT redstor DOT com
Web:            www.redstor.com

REDSTOR LIMITED
Torridon House
73-75 Regent Quay
Aberdeen
UK
AB11 5AR



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