From: Bob.Kelley@BRINKSINC.COM
Date: Wed May 28 2003 - 11:54:23 EDT
Just to add to Simon's comment, if you do enable AIO on your system, I
would recommend setting max=500 and min=whatever. There is no performance
tax for this setting, and this will allow you to guage how many of these
servers are used with your app. Afterwhich, you can set max=whatever active
only after next reboot. This way, you tune this setting specifically for
your apps needs.
FYI "pstat -a|grep aio|wc -l" will tell you how many async servers have
been started at any given time.
I was an "IBMr" in another life time and recommended to my customers that
a setting of 10 times the number of physical drives on the system was a
good rule of thumb, but have steered away from that since......Let me know
if I can help you further on this aio stuff.
Bobby Kelley
Sr. AIX/UNIX Administrator
BRINKS
972-877-5341
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>------------------------------------------------------------------------------------------------------------------------------|
| |
| To: aix-l@Princeton.EDU |
| cc: |
| Subject: Re: performance question |
>------------------------------------------------------------------------------------------------------------------------------|
AIO's good, but only if the application is configured to use it. Simply
enabling it and adding servers won't do anything.
Simon Green
Altria ITSC Europe s.a.r.l.
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: abdellah.djebli@SICKKIDS.CA [mailto:abdellah.djebli@SICKKIDS.CA]
> Sent: 23 May 2003 16:46
> To: aix-l@Princeton.EDU
> Subject: Re: performance question
>
>
> After setting the vmtune to (-p10 -P30)the paging is gone and
> the system is
> doing a lot better.
> The IO like you said, could be network related, which I hgave to
> investigate,
> because the system has two NICs (10/100), each on a different network.
> I have also noticed that aio on the sytem is not used. It is
> in a define
> state
> only. Would it help to set it up with 10min/20max aioservers.
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