Paul
Kinda guessing you are replying to emails without reading all responses.

In response, the backbone / NICS are all 1GB for all clients.

One policy that contains ALOT of clients has a Schedule set to multiplex 25
and the max the storage unit can do is 25.

Another reason for doing this, was to limit the amount of tapes used for the
backups. But this is purely for one policy that contains what I class as
"low priority" clients with small amounts of Data.

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: Paul Keating [mailto:pkeating at bank-banque-canada.ca] 
Sent: 31 July 2006 14:16
To: veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] Multiplexing


Or at the very least, multiplexed to a lower value than 25.

However, if you are using fast tape and a slow network/clients, the slowness
of the clients will obscure the performance penalty of multiplexing.

I've done some testing, and got MPX >= 10, and saw no performance hit for
backup or restores for 100Mb/s clients.....however, with high performance
clients running SAN attached disk and dedicated GigE cards for backup, I saw
significant performance hit between between MPX=2 and MPX=3...the difference
between MPX=2 and no multiplexing was negligable.

Paul

-- 


> -----Original Message-----
> From: veritas-bu-bounces at mailman.eng.auburn.edu
> [mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf 
> Of Liddle, Stuart
> Sent: July 31, 2006 2:59 AM
> To: WEAVER, Simon; 'Mansell, Richard'; 
> veritas-bu at mailman.eng.auburn.edu
> Subject: Re: [Veritas-bu] Multiplexing
> 
> 
> Simon,
> 
> Fine....believe what you want....but the numbers don't lie.
> 
> If you ever try any testing of this you will see that  restores are 
> significantly faster when you do them from non-multiplexed tapes.
> 
> --stuart
> 

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