Re: AW: S85 not quite right !!
From: Bill Verzal (BVerzal_at_KOMATSUNA.COM)
Date: 06/30/03
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Date: Mon, 30 Jun 2003 12:49:32 -0500 To: aix-l@Princeton.EDU
I always thought it was:
never set maxfree to less than (minfree+maxpgahead) * # CPUs
BV
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Bill Verzal
AIX Administrator, Komatsu America
(847) 970-3726 - direct
(847) 970-4184 - fax
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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.
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