RE: Oracle RAC, SAN & minimal LUN sizes for OCR/VOTING disks
Date: Mon, 2 Nov 2009 20:17:46 +0100
Message-ID: <4814386347E41145AAE79139EAA398980D33E9FA14_at_ws03-exch07.iconos.be>
If I'm not mistaken, both ocr and voting disks have to be 300MB in 11gR1.
Freek D'Hooge
Uptime
Oracle Database Administrator
email: freek.dhooge_at_uptime.be
tel +32(0)3 451 23 82
http://www.uptime.be
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Surachart Opun Sent: maandag 2 november 2009 19:26
To: Oracle-l
Subject: Re: Oracle RAC, SAN & minimal LUN sizes for OCR/VOTING disks
- What is the minimal # of OCR & VOTING disks needed for a production (I mean production) system
From 10g R2 , Oracle Recommend OCR and VOTING File 256 MB and If you have plan to use ASM, don't forgot to allocate for SPFILE (ASM) 50M
If you have plan to use 11gR2, you can store OCR, VOTE and SPFLE(ASM) in ASM DiskGroups (DGDATA or DGFRA).
- will having a 72 GB LUN for OCR or VOTING cause performance issues? I have no idea... But You may make partition from your LUN (72 GB)
Example: sub partition disk (use 1 OCR File + 1 VOTE File, if Storage is A High Availability )
72 GB = /dev/emcpowera
/dev/emcpowera1 = 256M = OCR
/dev/emcpowera2 = 256M = VOTE
/dev/emcpowera3 = 50M = SPFILE(ASM)
/dev/emcpowera4 = ASM Disk Group
Surachart Opun
http://surachartopun.com
On Tue, Nov 3, 2009 at 12:37 AM, Pradeep Chetal <Pradeep.Chetal_at_mformation.com> wrote:
Folks,
We have an installation where we mentioned DGDATA and DGFRA LUN sizes of 72 GB. However, we forgot to mention the OCR & VOTING LUN sizes. This was 4-5 months ago.
The infrastructure team mentioned that they have a SAN which has minimal LUN size of 72 GB and they can't bring SAN down for us as there are other apps running on that. This means that we have to give up part of DGDATA and DGFRA for this large LUN sizes.
Since we cannot do any RAC without OCR and VOTING, I have 2 questions:
- What is the minimal # of OCR & VOTING disks needed for a production (I mean production) system
- will having a 72 GB LUN for OCR or VOTING cause performance issues?
Thanks,
- Pradeep
Pradeep Chetal
Sr. Director - Infrastructure Architecture
Mformation Technologies Inc.
Switchboard: +1 732 692 6200
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