Patrick's right that the perfromance problem is probably due to  the
swappiness setting. the 2.4 kernel didn't have this option but a
swappiness value of 0 gives the 2.6 kernel something close to what 2.4
is running.  the default is 60 and no matter how much ram you have TSM
will be swapped out to disk and run like a dog. i saw this with vmstat,
once i set swappiness to 0, TSM ran like a scalded dog.

but again you need to have plenty of ram and TSM needs to be  the only
major application running on the server. basically changing this option
tunes the kernel performance between an application or a print/file
server.

john

Subject:  Re: TSM and Linux
From:  Patrick Boutilier <boutilpj AT EDNET.NS DOT CA>
To:  ADSM-L AT VM.MARIST DOT EDU
Date:  Tue, 27 Feb 2007 11:28:07 -0400

Leigh Reed wrote:

>Patrick
>
>You don't mention your version of TSM server or h/w platform and this
is a fairly old APAR but I thought I'd mention it.


TSM server 5.3.4.x on Intel (Dell 2950) hardware.

>APAR IC47731  deals with poor performance on Linux kernel 2.6 on
zSeries.


Did see that APAR a while ago. The vm.swappiness setting mentioned
earlier might be something to try if I ever feel the need to try and
upgrade again. :-)



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