That's good for backup speeds, but it sucks for restores.  Unless all of
your clients have really slow network connections, having a high
multiplexing value is not really a good idea.

You might want to consider dropping the multiplexing down to something like
6.  

Our configuration uses VTL's to our first backup copy and then I use vault
to put it to physical tape.  I multiplex to the VTL and single-stream to the
physical tapes.  Once it is on the physical tape, we have a script that will
bpexpdate the copy 1 image on the VTL (this is not an automatic option in
NetBackup until version 6.x).

When you do a restore from a physical tape, you have a single-stream copy
and not one that is multiplexed....this makes for a faster restore.

--stuart 

-----Original Message-----
From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of WEAVER,
Simon
Sent: Thursday, July 27, 2006 11:22 PM
To: 'Mansell, Richard'; veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] Multiplexing


Richard
Yes I use multiplexing a lot

NBU 5.1 Master MP2 + 2 SAN Media Servers

4 drives in a robot - using SSO

1 Storage Unit set to multiplex 25 jobs per drive (Master)
2 SAN Storage Units set to use 2 drives, multiplex 8 per drive

Seems to work - get a lot of jobs done - around 300 per night if that helps.

Regards

Simon Weaver
3rd Line Technical Support
Windows Domain Administrator 

EADS Astrium Limited, B23AA IM (DCS)
Anchorage Road, Portsmouth, PO3 5PU

Email: Simon.Weaver at Astrium-eads.net



-----Original Message-----
From: Mansell, Richard [mailto:Richard.Mansell at ccc.govt.nz]
Sent: 27 July 2006 22:31
To: veritas-bu at mailman.eng.auburn.edu
Subject: [Veritas-bu] Multiplexing



We are struggling to get all of the backups run during the backup window and
one of the obvious solutions is to start using multiplexing as the tape
drives are not being driven at any where near their maximum throughput.
There has been a rather nasty multiplexing problem fixed in 6.0 MP3 but I
would be interested to do a straw poll of how many people are using
multiplexing and if possible any issues encountered.

I would appreciate it if you would respond (off list) as to whether you use
multiplexing or not (any version of NetBackup). I will summarise the results
and post back to the list.

Regards

Richard


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