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
>
>
>
> Visit WWW.MFORMATION.COM and see how the MFORMATION SERVICE MANAGER can
> help you to transform your business
>
>
> Please consider the environment before printing
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>

--
http://www.freelists.org/webpage/oracle-l