Re: How to convert RAC database to single Instance Database
- From: Tim Gorman <tim@xxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 30 Aug 2004 20:23:02 -0600
Ah, that explains the swapping of the shared libraries! Thank you!
Problem is, the installation instruction (both Veritas's and Oracle's) do
not explicitly instruct to save the old libraries; they just provide the
exact "cp" commands to overwrite what's in "$ORACLE_HOME/lib". Awfully
tempting to just copy/paste them. Out of habit, I saved the old ones to
".old" names first. Went through all this last week, but clearly I hadn't
digested the meaning of all the steps yet. Thank goodness for old habits,
though.
Thanks for the insight, Sten!
on 8/30/04 7:05 PM, Rognes, Sten at Sten.Rognes@xxxxxxxxxx wrote:
>
> 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 ORA-
> you 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
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