This is ext3 as already mentioned in the thread by Andrew:

I'm using IBM ds400 fc disk system. Filesystem io options set to "async",
ext3. listener.log looks fine.

<frank.westheider@(protected):
> Hi !
>
> If you can't use directio..are you using the reiserfs-mountoption "notail" ?
> That's the reason for the hanging processes with direct-io....
>
> Bye
>   Frank
>
> -----Ursprüngliche Nachricht-----
> Von: Andrew Edunov [mailto:and@(protected)]
> Gesendet: Donnerstag, 16. November 2006 15:32
> An: 'Kostya Alexandrov'; 'Fabrizio Magni'
> Cc: suse-oracle@(protected)
> Betreff: RE: [suse-oracle] CPU utilization on system level
>
> Thanks for advice.....
>
> I have some problem with direct io, oracle hangs after turn this parameter
> on.
> It's no possible to move to x86_64 because of hardware(IBM x365).
>
>
>> Dear, Anrew,
>>
>> I think, so problems possible for 20 connections/minute.
>> each dedicated connection is fork(), so sys time cpu utilization
>> possible, but I think so not so much.
>> Also, possible that problems in linux cache, i'm strongly recommend you
>> to setup support of direct IO.
>> And if you really want to use all of 32G of ram, setup x86_64 version of
>> oracle and linux.
>
>





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