RE: RAC on Linux moving OCR and Voting disk to another SAN
Date: Wed, 21 Oct 2009 19:21:12 +0200
But during the period that you run on the mirrors, you are vulnerable for split brain situations. I would rather use the methods described in 428681.1 and just make sure that you have a backup of the votingdisks (using dd) and the ocr volumes (ocrconfig -export) on local disk. In case of a problem you can quickly restore them to the old luns (which you can remain attached to the servers).
For migration of the asm disks, you can just add the new luns to the asm disk groups and then remove the old ones.
I have used this scenario already with several customers when they migrated to a new san.
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From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Crisler, Jon Sent: woensdag 21 oktober 2009 19:08
To: Mark W. Farnham; oracle-l_at_freelists.org Subject: RE: RAC on Linux moving OCR and Voting disk to another SAN
I think one of our major concerns is to prevent a failure due to disk issues on the old SAN. If I add mirrors to the new SAN for OCR and Voting disk (VD), we can then worry about removing the old ocr and vd during a maintenance window at our leisure.
From: Mark W. Farnham [mailto:mwf_at_rsiz.com] Sent: Wednesday, October 21, 2009 11:53 AM To: mwf_at_rsiz.com; Crisler, Jon; oracle-l_at_freelists.org Subject: RE: RAC on Linux moving OCR and Voting disk to another SAN
I see K Gopalakrishnan has already responded and added a version
even spelled his own name correctly. Sorry about the extra "la" in my earlier post.
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Mark W. Farnham
Sent: Wednesday, October 21, 2009 11:43 AM To: Jon.Crisler_at_usi.com; oracle-l_at_freelists.org Subject: RE: RAC on Linux moving OCR and Voting disk to another SAN
Having not done this yet personally and having only read about it, take
with a grain of salt and of course read the manuals. My thoughts would trend
toward adding new OCR and voting disks in the desired locations and then later removing the ones to be removed. I believe that without adding "mirrors" (which I wish they called plexes or image copies, because hey, they are really not backward images) you have to have an outage to move them.
I believe the commands you want are ocrconfig and crsctl.
I think I've seen the details in K Gopalalakrishnan's book on RAC, and
the Julian Dyke/Steve Shaw book as well if you need something more succinct
and clear than the manuals.
without any downtime. However, we cannot figure out if it is possible to move the OCR and Voting disk with no downtime. Does anybody have any <snip>
http://www.freelists.org/webpage/oracle-l Received on Wed Oct 21 2009 - 12:21:12 CDT