From: Holger.VanKoll@SWISSCOM.COM
Date: Mon Jun 30 2003 - 16:05:41 EDT
from http://nscp.upenn.edu/aix4.3html/aixbman/prftungd/vmmpage.htm
maxfree should be greater than minfree by at least 8 (or by maxpgahead, whichever is greater).
I ´ve never seen this formula with the CPUs.
However, I had to increase minfree on some SMP systems because the fre-list became 0 many times.
Of course that might happen on a 1-2 cpu system, too.
-----Ursprüngliche Nachricht-----
Von: Bill Verzal [mailto:BVerzal@KOMATSUNA.COM]
Gesendet: Mo 30.06.2003 19:49
An: aix-l@Princeton.EDU
Cc:
Betreff: Re: AW: S85 not quite right !!
I always thought it was:
never set maxfree to less than (minfree+maxpgahead) * # CPUs
BV
--------------------------------------------------------
Bill Verzal
AIX Administrator, Komatsu America
(847) 970-3726 - direct
(847) 970-4184 - fax
|---------+---------------------------->
| | Holger.VanKoll@SW|
| | ISSCOM.COM |
| | Sent by: IBM AIX |
| | Discussion List |
| | <aix-l@Princeton.|
| | EDU> |
| | |
| | |
| | 06/30/2003 12:39 |
| | PM |
| | Please respond to|
| | IBM AIX |
| | Discussion List |
| | |
|---------+---------------------------->
>-------------------------------------------------------------------------------------------------------------------------------|
| |
| To: aix-l@Princeton.EDU |
| cc: |
| Subject: AW: S85 not quite right !! |
>-------------------------------------------------------------------------------------------------------------------------------|
never set maxfree to less than minfree+maxpgahead
so, set it to 128+64 and see if that changes something
-----Original Message-----
From: Spencer Johnson [mailto:Spencer.Johnson@2020LOG.COM]
Sent: Monday, June 30, 2003 10:34 AM
To: aix-l@Princeton.EDU
Subject: Re: S85 not quite right !!
Thanks for replies Mark / Simon,
To answer some of your questions :
- Disks are 50% active on average is quite good as this
means layout of database is good.
- Our vmtune settings are currently :
vmtune: current values:
-p -P -r -R -f -F
-N -W
minperm maxperm minpgahead maxpgahead minfree maxfree
pd_npages maxrandwrt
104855 209711 2 64 128 144
524288 0
-M -w -k -c -b -B
-u -l -d
maxpin npswarn npskill numclust numfsbufs hd_pbuf_cnt
lvm_bufcnt lrubucket defps
1677691 100608 25152 1 93 1584
9 131072 1
-s -n -S -L
-g -h
sync_release_ilock nokilluid v_pinshm lgpg_regions
lgpg_size strict_maxperm
0 0 0 0
0 0
-t
maxclient
1676868
number of valid memory pages = 2097113 maxperm=10.0% of
real memory
maximum pinable=80.0% of real memory minperm=5.0% of
real memory
number of file memory pages = 942297 numperm=44.9% of
real memory
number of compressed memory pages = 0 compressed=0.0% of
real memory
number of client memory pages = 0 numclient=0.0% of
real memory
# of remote pgs sched-pageout = 0 maxclient=80.0% of
real memory
-------- IBM have also suggest turning sync_release_ilock
(s) to 1 and strict_maxperm (h) to 1.
I will be shortly upgrading our Dev server to ML 11, will
let you know how I get on.
Spencer
-----Original Message-----
From: Green, Simon
[mailto:Simon.Green@EU.ALTRIA.COM]
Sent: 30 June 2003 15:29
To: aix-l@Princeton.EDU
Subject: Re: S85 not quite right !!
The only problems I have experienced - other than
an actual shortage of resources - have been due to the wrong vmtune
settings. (And remember that the default settings are NOT good for a
database.)
It's worth considering AIO as well, but I've never
had a problem with that.
The sort of settings I use are:
/usr/samples/kernel/vmtune -p3 -P8 -b400
That's taken from an 8-way S7A with 8GB memory,
running SAP with a 750GB database. It's quite busy, but has almost no
paging. It's based on our experience and recommendations from SAP.
If you don't have something similar - particularly
the -p/-P - then take care of that before tackling anything else.
When you say the disks are "only 50% busy" what do
you mean? If that's either I/O Wait or % active then I'd say it's on the
high side. What sort of disk subsystem do you have?
Simon Green
Altria ITSC Europe Ltd
AIX-L Archive at
http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
AIX FAQ at http://www.faqs.org/faqs/aix-faq/
N.B. Unsolicited email from vendors will not be
appreciated.
-----Original Message-----
From: Spencer Johnson
[mailto:Spencer.Johnson@2020LOG.COM]
Sent: 30 June 2003 14:49
To: aix-l@Princeton.EDU
Subject: S85 not quite right !!
Hi list,
I have a slight problem / issue, this is
related to an 7017-S85 server, connected to F20 ESS. The server is a 6W - 8
GB RAM running Oracle 8.1.7.4 with
database instance of approx. 1 TB.
The problem is that most operations (coping
files, etc) cause the system to page and send the CPU's into Wait state
constantly, I have logged a call with IBM and they have
come back with a few suggestions of
changing vmtune parameters.
Oracle is tuned to allow for 6W processors
but I feel that the O/S is being restricted by something. The disks do not
perform that much work (only 50% busy at max).
The O/S is currently at 4.3.3 ML 10, but am
considering going to ML 11.
Has anyone out there had similar
experiences and how have they been overcome.
***************************************************************
Disclaimer :-
and intended solely for the use of the
individual to whom it is addressed. Any views or opinions
are solely
those of the author and do not necessarily represent those
of
20:20 Logistics Ltd, Dextra Accessories Ltd,
The Discovery Store Ltd and The Mobile Phone Repair Company
Ltd.
If you are not the intended recipient, be advised that you
have
received this email in error and that any use,
dissemination,
forwarding, printing or copying is strictly prohibited. If
you
have received this email in error please delete it from
your system
and notify the sender immediately.
***************************************************************
This archive was generated by hypermail 2.1.7 : Wed Apr 09 2008 - 22:16:58 EDT