Networker

Re: [Networker] target sessions

2002-08-23 09:05:31
Subject: Re: [Networker] target sessions
From: "Rymwid, Peter" <prymwid AT TIAA-CREF DOT ORG>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Fri, 23 Aug 2002 09:08:07 -0400
Hi Mathew,
Good answer, but how do you implement parallelism factor on jukebox into
this picture?

Peter Rymwid

-----Original Message-----
From: Matthew Bourne [mailto:mbourne2001 AT LYCOS.CO DOT UK]
Sent: Friday, August 23, 2002 7:40 AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] target sessions


Hi,

How many savesets are there in your 375GB backup ?

The server parallelism sets a limit on the number of concurrent savesets
occurring at any given point - so if you have a parallelism value of 16,
your backup server can write up to 16 different savesets continuously.

Assuming that you have enough savesets to fill this capacity, and that all 8
of your drives are used for the backup, you might only be writing 2 savesets
per drive.

The other factor to consider here is the target sessions value for each of
your drives.  I have found that my DLT7000 drives yield the best streaming
rate when they are writing 6 savesets each - having 2 of these drives, I
have set the server parallelism to a value of 12, and the target sessions
for each drive to a value of 6.

The point is, it doesn't matter how large you set the target sessions
parameter for each of your drives - if your server parallelism isn't large
enough to use those target sessions then your backups may be running at less
than optimum speed.

Regards,

Matthew

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