Dave, Karl,

  I think that what Karl is asking is if the same drive can be used for
MPX and non-MPX backups (the answer is yes - the minimum of the MPX
level on the STU and the MPX level on the schedule will determine the
number of streams actually sent to each device).  The "DB slices" will
not run the risk of being multiplexed if they are in a separate
schedule, and the schedule MPX is set to 1.  If the "DB slices" are in a
filesystem policy, and the MPX is set to >1, then they may be
multiplexed.

Message: 7
Subject: RE: [Veritas-bu] Multiplexing Tapes
Date: Thu, 5 Feb 2004 09:06:16 -0700
From: "David Chapa" <david.chapa AT adic DOT com>
To: <Karl.Rossing AT Federated DOT CA>, <veritas-bu AT mailman.eng.auburn DOT 
edu>

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As you know MPX has to be set up in two locations, the Storage unit and
then the Schedule.  If the Storage Unit allows 6 MPX streams, and you
are using the same stu for both your "non-mpx" and MPX policies, you do
run the risk of multiplexing your DB's with your MPX policies.  to
ensure this will not happen, create another STU with MPX-1.  check out
the Admin guide for a visual of how this works.
=20
david
=20
David A. Chapa * Technical Advisor, Technical Marketing * ADIC *
720.249.5836 * david.chapa AT adic DOT com
Pathlight VX - Integrated Disk-to-Tape Backup - http://www.adic.com
<http://www.adic.com>=20
-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of
Karl.Rossing AT Federated DOT CA
Sent: Thursday, February 05, 2004 8:52 AM
To: 'veritas-bu AT mailman.eng.auburn DOT edu'
Subject: [Veritas-bu] Multiplexing Tapes
=20

Hi,=20

There are advantages to multiplexing tapes(better speed) and
disadvantages (not being able to use tar or dd).=20

I'm wondering if the following scenario is possible using a single tape
drive.=20

Multiplex our Solaris and Win2k OS backups onto one tape.=20

Do not multiplex our database slices on to a single tape. Our db's are
large and thus don't encounter slower speeds. We can read them using tar
which is great for DR. We can use DD if we have a bad tape. We can=20

Is this possible without changing the multiplexing settings on the
storage unit?=20

Thanks,=20

Karl