Re: OCFS tuning

Hi again,

Here are some more details:

the servers are Compaq DL580 - Linux RedHat AS 2.1 with kernel 2.4.9e8smp and corresponding ocfs.

The shared storage is a Compaq SAN MSA1000 whith 3 raid1 volumes of 36Gb each.

What I mean by slow:

If I use a "normal" FS (ext3 on a standalone machine) my sample import takes 32 mins.

When I use OCFS with 4Kb blocks, it takes 1H12mins (and the .dmp is NOT on OCFS)
When I use OCFS with 128Kb blocks, it takes 47mins (nearly the same as rawdevices on the NAS)

Then, the selects I do take take between 10 and 100% much more time than the ones on the standalone database with ext3 FS (when they are not cached of course).

That is why I would appreciate relevant tuning tips for OCFS.

Regards,
Christian

"Howard J. Rogers" <howardjr2000_at_yahoo.com.au> wrote in message news:<6BLX9.30799$jM5.79285_at_newsfeeds.bigpond.com>...
> "Christian" <penon_at_yahoo.com> wrote in message
> news:fd42b14b.0301220119.7012424_at_posting.google.com...
> > Hi everybody,
> >
> > I have installed 9iRAC on two Compaq servers with OCFS on a san array.
> > The problem is that it is V E R Y S L O W...
>
>
> I take it these are Windows servers? I only ask because Compaq's Tru64
> wouldn't need Oracle's Cluster File System.
>
> But in any case: define "slow". As far as I can tell, the CFS for Windows is
> optimized for Oracle's access only. Trying to save a Word document on it,
> for example, is indeed slow. But the RAC runs fine.
>
> Are you saying your RAC is suffering from I/O performance issues? Or just
> that when you play around with the shared disk via Explorer or some other
> non-Oracle application, you feel it's slow?
>
> Regards
> HJR
>
>
> >
> > Does someone know ANYTHING about the relevant block size of OCFS or other
> > parameter to enhance perfs (I use 8 Kb bs and I'll try with 128 Kb
> today)???
> >
> > Thank you for your help,
> > Christian.
Received on Fri Jan 31 2003 - 08:53:56 CST