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List:       aix-l
Subject:    Re: performance question
From:       Hans-Dieter Kutz <hdkutz () HDKUTZ ! DE>
Date:       2003-05-29 18:27:05
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Hello List,
found a setting for AIO in Redbook:
Database Perfomance Tuning on AIX

Cheers,
ku
On Wed, May 28, 2003 at 10:54:23AM -0500, Bob.Kelley@BRINKSINC.COM wrote:
> 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
> 
> 
> 
> > ---------+---------------------------->
> > > "Green, Simon"   |
> > > <Simon.Green@EU.A|
> > > LTRIA.COM>       |
> > > Sent by: IBM AIX |
> > > Discussion List  |
> > > <aix-l@Princeton.|
> > > EDU>             |
> > > > 
> > > > 
> > > 05/23/2003 11:49 |
> > > AM               |
> > > Please respond to|
> > > IBM AIX          |
> > > Discussion List  |
> > > > 
> > ---------+---------------------------->
> > ------------------------------------------------------------------------------------------------------------------------------|
> > 
> > > 
> > 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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