Re: RAC/CRS and OCFS2

From: DA Morgan <damorgan_at_psoug.org>
Date: Thu, 15 Mar 2007 11:23:34 -0700
Message-ID: <1173983012.892770@bubbleator.drizzle.com>

Comments in-line.

Keith wrote:
> On Mar 15, 11:45 am, DA Morgan <damor..._at_psoug.org> wrote:

>> Keith wrote:
>>> Hello RAC gurus,
>>> I am currently running 10.2.0.3 RAC/CRS on RHEL4.  All our database
>>> files are using ASM/raw devices.  However, we now have the need for a
>>> clustered file system.  This file system likely would not be used
>>> directly by the database, but requires high availability.  So, we'd
>>> like to use OCFS2 -- which has prompted some questions:
>> I'm confused by your question ... OCFS is a file system. What does a
>> file system not being used by the database have to do with highly
>> available anything?
>>
>> Are you expecting your file system to load balance? To have failover?
>> I'm at a bit of a loss here to understand your intention.
>>
>> About the only thing I can say is that I share hpuxrac's concern
>> about your lack of testing and a file system not be used for Oracle
>> has nothing to do with the CRS.
>> --
>> Daniel A. Morgan
>> University of Washington
>> damor..._at_x.washington.edu
>> (replace x with u to respond)
>> Puget Sound Oracle Users Groupwww.psoug.org

>
> By highly-available, I'm referring to making a file system available R/
> W from two or more nodes. Should a node fail, the file system would
> still be available from a second (or more) node. I am not expecting
> to load balance; simply minimize (or avoid) down time of the file
> system.
>
> My concern with CRS and OCFS2 is that both provide clustering services
> and I'm not sure what the expected behavior is under certain
> clustering situations. For example, if the clustering services of
> OCFS2 have a split-brain-type situation, is it going to reboot the
> system? Since I'm not supporting my DB over OCFS, I'm not sure I
> would want such behavior.

It would really be helpful if you stated what it is you intend to use the file system to do. SQL*Loader? External tables? UTL_FILE? Control Files? What you intend is still not stated.

> I have 1-1/2 weeks before my migration, which isn't much time; but I
> would definitely perform as much testing as I can. I'm just trying to
> make a determination if this is feasible and practical; or if there's
> simply a better way to do it, before attempting anything.

A better way to do what? You still haven't stated what it is you are trying to do.

-- 
Daniel A. Morgan
University of Washington
damorgan_at_x.washington.edu
(replace x with u to respond)
Puget Sound Oracle Users Group
www.psoug.org

Received on Thu Mar 15 2007 - 13:23:34 CDT