Re: Solaris 9 UFS,directIO,async,filesystemio_options

Oracle can use mixed raw/ufs database layout. It will use kaio call when writing to redo log, and lwp async when write to ufs datafiles.

Unless your system is really heavy write, async doesnot help much. I perfer directio+multiple dbwr.

On Tue, 1 Mar 2005 12:31:21 -0800, Stalin <stalinsk_at_gmail.com> wrote:
> Hi All,
>
> With the enhancement to UFS concurrent direct IO in solaris 9i, I was
> planning to use UFS for datafiles and still stick with raw volumes for
> redo logs and temporary tablespace. In this mixed setup, what value
> should i set for filesystemio_options ? direct io or setall .
>
> also, does async io still go through threaded lwp async emulation or
> use KAIO for above setup ?. I doubt kaio can work on anything but
> pure raw volumes or vxfs quick io.
>
> Appreciate any inputs.
>
> Stalin
> --
> http://www.freelists.org/webpage/oracle-l
>

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Zhu Chao
www.cnoug.org
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