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RE: Recovering your system - QMCHPOOL



fixed

Rob,

Refresh my memory, but I thought machine pool was set by the system value, QMCHPOOL.
Auto tune takes care of everything but the machine pool.

Paul

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Tuesday, April 15, 2014 9:29 AM
To: Midrange Systems Technical Discussion
Subject: RE: Recovering your system - QMCHPOOL

If you have auto tuner going you probably do not need to adjust it. That recommendation is from the manual "Recovering your system". It's a section intended for someone who is restoring to a new hardware box, in dedicated state, with no performance tuner running. As a recommended initial size. It's also followed by this statement:
"For a more precise setting of the QMCHPOOL system value, see the Types of memory pools information center topic."


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1 Group Dekko Dept 1600 Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: "Steinmetz, Paul" <PSteinmetz@xxxxxxxxxx>
To: "'Midrange Systems Technical Discussion'"
<midrange-l@xxxxxxxxxxxx>
Date: 04/15/2014 09:01 AM
Subject: RE: Recovering your system - QMCHPOOL
Sent by: midrange-l-bounces@xxxxxxxxxxxx



Production LPAR is 196gb, machine pool is currently 22gb, 15% would be
29gb.
R&D LPAR is 40g, machine pool currently 2gb, 15% would be 6gb
Upgrade partition is 6gb, machine pool currently .5gb, 15% would .9gb

Should I consider adjusting the machine pools upward?
Not having any performance issues.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [
mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Tuesday, April 15, 2014 7:49 AM
To: Midrange Systems Technical Discussion
Subject: RE: Recovering your system - QMCHPOOL

Sue,

Thank you for looking up that information.

Since the minimum memory per partition is 256MB, then this:
As a general rule, if the main storage size is 64 MB or larger, change the
QMCHPOOL system value to be 15 percent of the main storage size. If the
main storage size is less than 64 MB, change the QMCHPOOL system value to
be 20 percent of the main storage size.

should be changed to:
As a general rule change the QMCHPOOL system value to be 15 percent of the
main storage size.

In all editions of the "Recovering your system" manual, 7.1 and on?

The only caveat being that this would be a good time to review this
general recommendation since it's a bit dated.


Rob Berendt





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