Networker

Re: [Networker] target sessions

2002-09-24 15:40:16
Subject: Re: [Networker] target sessions
From: Deb <deb AT TICKLEME.LLNL DOT GOV>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Tue, 24 Sep 2002 12:39:56 -0700
How does one do "the math" to determine what my streaming rate is for my
drives?  I would like to check both my dlt7k and my dlt8k drives for the
streaming rate, but in practice, I don't know how to, except to look at
the GUI while the tape is being written.  Wouldn't it be better to capture
that information somehow?  I've never seen information about how to do that.

Inquiring minds wanna know!  :-)

deb

Matthew Bourne <mbourne2001 AT LYCOS.CO DOT UK> had this to say,
> 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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