Ocfs2 users - Oct 2005 - Shared Oracle Home

Hi,

I've implemented a 2-node RAC cluster for Transparent Application Failover
in 9i/OCFS, and am now looking at implementing 10g/OCFS2.

The OCFS2 Users Guide states that the datafile, voting disk file, OCR file etc
volumes must be mounted with the o_direct flag, but that the Oracle home volume
should be mounted without it. Effectively, this seems to require another set of
shared disks just for the shared Oracle home.

Is this advice regarding the Oracle Home volume a mandatory 'should' or
just advisory? With the size of the disks we're using at 72G it's hard
to justify another redundant pair just for the Oracle Home unless it's
absolutely essential (although it's not a big cost in the scheme of things).

Also, if we choose not to put in another pair of disks for the Oracle home, does
OCFS2 still support separate Oracle installation on each RAC node?

Thanks in advance,
Gavin
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SCOTT, Gavin wrote:
> Hi,
>
> I've implemented a 2-node RAC cluster for Transparent Application 
> Failover in 9i/OCFS, and am now looking at implementing 10g/OCFS2.
>
> The OCFS2 Users Guide states that the datafile, voting disk file, OCR 
> file etc volumes must be mounted with the o_direct flag, but that the 
> Oracle home volume should be mounted without it. Effectively, this 
> seems to require another set of shared disks just for the shared 
> Oracle home.
>
It's "datavolume" mount option.
> Is this advice regarding the Oracle Home volume a mandatory
'should'
> or just advisory? With the size of the disks we're using at 72G
it's
> hard to justify another redundant pair just for the Oracle Home unless 
> it's absolutely essential (although it's not a big cost in the
scheme
> of things).
>
There are more than one reason why you would not want to mix oracle home
and datafiles, etc. in the same volume. For starters, you would want to 
use different
clustersizes... large (128k+) for datafile volume and around 32K for home.
The mount option is another. The faq has the reasoning behind this flag.
> Also, if we choose not to put in another pair of disks for the Oracle 
> home, does OCFS2 still support separate Oracle installation on each 
> RAC node?
>
Sure, why not.
> Thanks in advance,
> Gavin
>
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