RE: Auto Tuning

Speaking only for myself, I will never turn off QPFRADJ.  If you set
appropriate limits it does its job well and there is no way manual tuning
can keep abreast of your system as it changes throughout the day.

The biggest problem I have noticed with QPFRADJ is that if you run an
application in it's own storage pool you may have performance issues when
the application starts and sufficient memory is not yet allocated to that
pool.  This can be easily solved by either manually moving the memory when
you start the application or using WRKSHRPOOL to set a minimum size for that
pool that is large enough for the app to start efficiently.  

We have the QINTER class set to a timeslice of 50.  If you change your
timeslice make sure that Eligible for purge is *YES and the system value
QTSEPOOL is set to *BASE.  Then you can watch jobs that exceed their
timeslice move to the base pool in WRKACTJOB.  Our batch timeslice remains
at 5000.

I also recommend moving all batch work into a separate shared pool.  This
includes things like HTTP servers, Domino and MQ Series.  Instructions for
this are here:
http://www-912.ibm.com/s_dir/slkbase.nsf/3cdf5d853ca698198625680b00020369/56
28f38ef557e22f86256d6c00698fd9?OpenDocument&Highlight=2,separate,batch,base

Every system is different, if your Wait->Inel and Active->Inel are both 0
and your faulting is relatively low you should be fine.  My thoughts on pool
activity levels (and I'm sure someone will correct me if I misspeak) are
that if too high activity levels are causing problems you probably need more
main storage.

Regards,

Scott Ingvaldson
AS/400 System Administrator
GuideOne Insurance Group

-----Original Message-----
date: Tue, 3 Feb 2004 05:44:08 -0800 
from: "Graap, Ken" <keg@xxxxxxxxxxxxx>
subject: RE: Auto Tuning

So, what would you recommend as an appropriate timeslice setting for batch
and interactive?

Kenneth

-----Original Message-----
From: Clare Holtham [mailto:Clare.Holtham@xxxxxxxxxxxxxx]
Sent: Monday, February 02, 2004 10:28 PM
To: Midrange Systems Technical Discussion
Subject: Re: Auto Tuning


Ken,

I think it's just one of those things like having the QINTER timeslice set
to a value more appropriate for a B10, that IBM never gets round to fixing!
And it's why you should, in my opinion, turn off automatic tuning and tune
the system yourself. This is especially true if your applications use SQL!

cheers,

Clare
   
This message and accompanying documents are covered by the Electronic
Communications Privacy Act, 18 U.S.C. §§ 2510-2521, and contains information
intended for the specified individual(s) only. This information is
confidential. If you are not the intended recipient or an agent responsible
for delivering it to the intended recipient, you are hereby notified that
you have received this document in error and that any review, dissemination,
copying, or the taking of any action based on the contents of this
information is strictly prohibited. If you have received this communication
in error, please notify us immediately by e-mail, and delete the original
message.