Re: memory and page faults (continued - again)


I think I need a little clarification please.
ps -k gives me 28 kproc processes (aix 433 server).
ps -k on an AIX 5L server gives me more info on the actual kernel process.
On that server I can see I have 32 and 10 of those are aioservers so is that what I'm looking for?
Just curious on the 'lots of sequential reads comment' was that gleaned from the filemon output I provided earlier?


Holger.VanKoll@xxxxxxxxxxxx 02/02/06 6:56 am >>>

you need to run cfgmgr (aix5) to make the changes of aioservers take effect
on 4.x you have to reboot if I remember correctly

use
ps -k
to see if the aioservers are equally loaded (cpu-load). if yes, increase maxservers until they are unequally loaded

you have lots of sequential-reads.
should you want to tune it further, look at maxpgahead (vmtune)


From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx] On Behalf Of Mark Schlechte
Sent: Wednesday, February 01, 2006 8:17 PM
To: aix-l@xxxxxxxxxxxxx
Subject: Re: memory and page faults (continued - again)


The result is 10. Is that a normal value?

Jennifer.Page@xxxxxxxxxxx 02/01/06 6:32 pm >>>

May want to bump up the maxservers, depends on how may async i/o queues are running?
pstat *a | egrep aios | wc -l
Thanks for the formulas though.

From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx] On Behalf Of Mark Schlechte

Sent: Wednesday, February 01, 2006 11:51 AM

To: aix-l@xxxxxxxxxxxxx

Subject: Re: memory and page faults (continued - again)
Thanks, should have mentioned we had bumped that up earlier based on an oracle error we saw.
DBWR TRACE WARNING: LIO_LITSIO RETURN EAGAIN

According to a doc I have it suggests:

minservers=10*#cpus

maxservers=(10*#disks)/#cpus

maxreqs= a multiple of 4096 > 4*#disks * queue_depth


I have 6 cpus, 28 disks (16+12)


Here's my setting if that helps.

lsattr -El aio0

minservers 75 MINIMUM number of servers True

maxservers 200 MAXIMUM number of servers True

maxreqs 8192 Maximum number of REQUESTS True

kprocprio 39 Server PRIORITY True

autoconfig available STATE to be configured at system restart True

fastpath enable State of fast path True


Jennifer.Page@xxxxxxxxxxx 02/01/06 5:14 pm >>>


Look at our asyc I/O (max/min servers) and maxreqs.

From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx] On Behalf Of Mark Schlechte
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