[Linux-cluster] May I turn on direct I/O and/or async I/O when using GFS as the cluster file system for Oracle9i RAC?

[Thai Duong]

Hi Wendy,

Thx for the information. I'll turn on direct I/O on my system. Do you have
any information about how many percent I should gain in term of I/O
performance when turning direct I/O on in general and with Oracle RAC in
particular?

TIA,

--Thai Duong.

On 2/13/06, Wendy Cheng <wcheng at redhat.com> wrote:
>
> Thai Duong wrote:
>
> > Hi there,
> >
> > I'm using Red Hat GFS 6.0 as the cluster file system for a 4-node
> > Oracle RAC 9.2.0.7 <http://9.2.0.7>, each node is running RHAS 3
> > Update 6. There're probably a lot of benefits in using direct I/O
> > and/or async I/O with Oracle9i RAC. RH GFS itself supports direct I/O
> > regardless of the application running on top of it. I have asked a
> > Oracle Support Service guy and he confirms that we can use direct I/O
> > feature of RH GFS but he doest have information about async I/O. May I
> > turn on direct I/O and/or async I/O (I mean recompile Oracle to
> > support async I/O) when using GFS as the cluster file system for
> > Oracle9i RAC? Do you have any experience with this? Please help.
> >
> Direct IO is ok for both GFS 6.0 and GFS 6.1. Asyn IO is enabled in >=
> RHEL 4 (GFS 6.1) Update 3 (in beta testing).
>
> Also there could have deadlock issues with Direct IO with Oracle under
> GFS 6.1 (<= RHEL 4 U2).
>
> -- Wendy
>
>
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