Re: Async I/O on AIX

From: Chuck <chuckh_at_softhome.net>
Date: Wed, 18 Sep 2002 11:44:16 -0400
Message-ID: <ama70i$40jgk$1@ID-85580.news.dfncis.de>

Thanks to all who have offered help. I currently have the max set at 80 and the aios count jumped to the max within a few hours of restarting the system.

Do you need to reboot to change this parameter or can you change it dynamically?

"Rauf Sarwar" <rs_arwar_at_hotmail.com> wrote in message news:92eeeff0.0209171128.2feee635_at_posting.google.com... > "Chuck" <chuckh_at_softhome.net> wrote in message news:<am7fea$3aun4$1_at_ID-85580.news.dfncis.de>...
> > "tingl" <tlam15_at_hotmail.com> wrote in message
> > news:f487699f.0209161411.4fd16379_at_posting.google.com...
> > > "Chuck" <chuckh_at_softhome.net> wrote in message
> > news:<am537c$2pm0o$1_at_ID-85580.news.dfncis.de>...
> > > > -----BEGIN PGP SIGNED MESSAGE-----
> > > > Hash: SHA1
> > > >
> > > > The Oracle 8i Administrator's Reference for AIX says to set the max
> > > > i/o servers to "at least 10*(number of disks that AIO accesses
> > > > simultaneously)". Can someone clarify whether they mean physical
> > > > disks, or logical filesystems? TIA
> > > >
> > > > -----BEGIN PGP SIGNATURE-----
> > > > Version: PGPfreeware 7.0.3 for non-commercial use
<http://www.pgp.com>
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> > > > iQA/AwUBPYYQJFVYIIV9CtSHEQLgTQCfRljaHtVp1TkI1R/2Ng6/T1Kv6lYAn1w4
> > > > zWexcehNN+v3YhQEBkNXId/S
> > > > =mzUG
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> > >
> > > Physical disks.

> >

> > Just to be sure then, if I have 15 file systems that are concurrently in
> > use, each of which is a 3 volume RAID logical device, I need 450 async
i/o
> > servers. Is that correct? It just seems like an awful lot.

> >

> > TIA

>
>
> Use,
>
> # pstat -a | grep -c aios
>
> to check the number of active AIO servers running and set your
> MAXSERVER value to higher then that. Keep checking this periodically
> to adjust MIN/MAX server params.
>
> //Rauf Sarwar

Received on Wed Sep 18 2002 - 10:44:16 CDT