[Veritas-bu] Meaning of MPX

MPX - is the ability to combine data from multiple sources (clients) to one
destination (tape).

An MPX value of 1 inidicates multiplexing is off or disabled for that
schedule.  Multiplexing must be greater than one to truly be multiplexing.

MPX value as it is associated with a storage unit is defined as the number
of multiplex streams this storage unit will allow per drive.  For example an
MPX value of 4 for Storage Unit ABC that is allowed to use 8 drives means up
to 32 streams can be managed by this single storage unit.

That said, it is important to remember that MPX must be configured in two
places with NBU, the Storage Unit and the  Schedule.  If the Storage unit is
configured for 4 streams per drive and the class that is running has a
schedule with an MPX value of 1, only one stream will sent from that class
per drive.

David

<><><><><><><><><><><><><><><><><><><><>
David A. Chapa
NetBackup Consultant
DataStaff, Inc.
http://www.consulting.datastaff.com
847 413 1144
---------------------------------------
NBU-LSERV AT datastaff DOT com - Adv. Scripting
http://www.xbpadm-commands.com

-----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 Robert L.
Harris
Sent: Monday, February 11, 2002 10:55 AM
To: Veritas-BU
Subject: [Veritas-bu] Meaning of MPX




There's currently a nice discussion of multiplexing on our backup
subsystem.  I need a good definition of it, what an MPX of 1 versus 4
means and how it affects normal system backups and RMAN (oracle)
backups.

Robert


:wq!
---------------------------------------------------------------------------
Robert L. Harris                |  Micros~1 :
Senior System Engineer          |    For when quality, reliability
  at RnD Consulting             |      and security just aren't
                                \_       that important!
DISCLAIMER:
      These are MY OPINIONS ALONE.  I speak for no-one else.
FYI:
 perl -e 'print $i=pack(c5,(41*2),sqrt(7056),(unpack(c,H)-2),oct(115),10);'

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