ADSM-L

Re: performace figure Gigabit network

2002-11-12 05:39:25
Subject: Re: performace figure Gigabit network
From: Koen Willems <koen_willems AT HOTMAIL DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Tue, 12 Nov 2002 10:37:07 +0000
Dear Marc,

I am runnin w2k dual p4 1GB mem 3583 scsi based.

The network is GB.

Right now I am tunning

tcpwindows size
buffpoolsize
txnbytelimit

movetresh
movesize
txngroupmax

The filesystem is filed with small files from 256kb to 15 mb.

The higest performance figure was:

2.126.68 network
886,00 aggregate

FTP does 20 MB a sec ???

So maybe my LTO is performing lousy

( give me magstar any day for small files )

Any sugestions ?

Best Regards,

Koen Willems






From: Mark Stapleton <stapleto AT BERBEE DOT COM>
Reply-To: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: performace figure Gigabit network
Date: Mon, 11 Nov 2002 16:29:51 -0600

From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
Koen Willems
> Can anybody give me an performance figure on restores speeds of a w2k
> user directory with lots of small files on a Gigabit ethernet work.
> I am tunnin resores and want to know wich performance is to be
> expected on gigabit...
> W2k + LTO + GB

As with any performance question, it entirely depends upon the file and
network environment. There are so many variables that asking a generic "how
fast should it be?" is rather a pointless pursuit.

Instead, follow good practices all around. Tune your server OS to optimum
file I/O, clear your network of bottlenecks with best practice standards,
and schedule TSM activities to even out the load as much as possible. If
you're buying a new server for TSM, buy one with decent memory and CPU
resources.

If you don't do these things (or don't know how), no amount of fiddling
with
TSM is going to give you quality throughput speeds. The #1 reason (in my
experience) for poor throughput in TSM is bad and/or poorly maintained
networks.

--
Mark Stapleton (stapleton AT berbee DOT com)
Certified TSM consultant
Certified AIX system engineer
MCSE

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