• Subject: Re: SYSTEM TUNING
  • From: "R. Bruce Hoffman, Jr" <rbruceh@xxxxxxx>
  • Date: Wed, 27 Oct 1999 11:47:06 -0400

-----Original Message-----
From: Debbie Helms <DHelms@Lance.com>
To: 'MIDRANGE-L@midrange.com' <MIDRANGE-L@midrange.com>
Date: Wednesday, October 27, 1999 11:16 AM
Subject: SYSTEM TUNING


>Tell me are there any real expert system tuners out there?  Can a system be
>tuned in a day at the very most a week?   I need some system tuning
>information where is the best place?


A Day? Yup. Turn on the auto tuner. System value QPFRADJ.

A Week? Yup. Turn on the auto tuner. System value QPFRADJ.

Of course, this all depends. On the size of your system. On the number of
jobs. On the number of users. On the diversity of the applications running.
On and on and on...

System tuning info, best place? (IMHO) COMMON. Barring attendance there, the
best place to start is the AS/400 Performance Tools book. If you don't have
the performance tools installed (quick way to check, see if the WRKSYSACT
command exists, if it does, you have the tools) then see the above two items
of advice.

Can it be done in a day? Maybe if the performance issue is HUGE and the
cause is HUGE and glaring.

Can it be done in a week? Maybe if the performance issue is HUGE and the
cause is Medium and glaring.

Probably take much longer to do any REAL tuning. Need to monitor system over
time and evaluate that. Need to understand application mix and usage over
time and evaluate that. Need to understand hardware and limitations. Need to
understand user expectations and manage them. Need to understand management
expectations and either manage that or get them to ante-up.

===========================================================
R. Bruce Hoffman, Jr.
 -- IBM Certified AS/400 Professional System Administrator
 -- IBM Certified AS/400 Professional Network Administrator

"The sum of all human knowledge is a fixed constant.
    It's the population that keeps growing!"



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