RE: How to convert RAC database to single Instance Database

From: Rognes, Sten <Sten.Rognes_at_schwab.com>
Date: Mon, 30 Aug 2004 18:05:01 -0700
Message-ID: <4BD75994A2DEC542AD401194FE45E62E027D741D@n1021smx.nt.schwab.com>

Got a couple of points to add to what Tim is saying:

• Some of the libraries (IPC and ODM) in your Oracle Home were replaced with Veritas ones during installation. You should copy the original Oracle libraries back when you de-RAC prior to relinking.
• My notes state that running non-RAC Oracle binaries on Veritas CFS is not supported. I did try this a year or so back, don't remember what exact ORAyou get, but you will notice. Can't find a reference to the explanation for this, but I believe it had something to do with a requirement for using the Veritas RAC ODM library for Oracle to do IO against a Veritas CFS. Either Veritas or Oracle should be able to get you the specifics. Veritas do have supported de-install path from DBE/AC to DBE which will bring you back to regular VxFS without compromising data. I've tested this backout path, and it works.

One benefit running non-RAC with Veritas CFS would be that you'd minimize the time to do a failover in a VCS cluster since you wouldn't have to deport/import the disk groups when failing over to a different node. However, as Tim points out the overhead of a clustered file system might outweigh what's gained. (That is if this was a supported config.)

Sten

-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Tim Gorman
Sent: Monday, August 30, 2004 5:00 PM
To: oracle-l_at_freelists.org
Subject: Re: How to convert RAC database to single Instance Database

Qaiser,

Did you contact Support, or Sales, for that answer? :-)

Admittedly, running non-RAC on a Veritas clustered file-system is unusual (i.e. falls into the "why would you do this?" department), but I can't see why it can't be supported. Except for all the bells and whistles and complications and overhead of a clustered file-system, it's just a file-system, right?

<SNIP>

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Received on Mon Aug 30 2004 - 20:01:05 CDT