Re: ASM and disk partitions offset

From: Riyaj Shamsudeen <riyaj.shamsudeen_at_gmail.com>
Date: Mon, 13 Feb 2012 17:00:13 -0600
Message-ID: <CAA2DszyD68VAqV+49NW92p0NjmL7pvqUnmnTKSReKe3r9dxRUA_at_mail.gmail.com>



I don't recollect exact details, but disk VTOC (Volume Table of Contents) information is kept in the initial part of the disk, in Solaris. You have to skip 1MB, so that VTOC is not overwritten. This applies only to Solaris, AFAIK. Cheers

Riyaj Shamsudeen
Principal DBA,
Ora!nternals - http://www.orainternals.com - Specialists in Performance, RAC and EBS
Blog: http://orainternals.wordpress.com
OakTable member http://www.oaktable.com and Oracle ACE Director

Co-author of the books: Expert Oracle
Practices<http://tinyurl.com/book-expert-oracle-practices/>, Pro Oracle SQL, Expert PL/SQL
Practices<http://tinyurl.com/book-expert-plsql-practices>

On Mon, Feb 13, 2012 at 4:31 PM, Radoulov, Dimitre <cichomitiko_at_gmail.com>wrote:

> Hi all,
> target environment:
>
> 11.2.0.3 RAC on RHEL 5.7 x86-64
> SAN HP 3PAR
>
> I'm reading the following note on MOS: RAC and Oracle Clusterware Best
> Practices and Starter Kit (Linux) [ID 811306.1],
> in the attached document RACGuides_Rac11gR2OnLinux.pdf is a step by step
> description of the GI and RAC installation process.
>
> Does anyone know what's the reason for the requirement for 1 MB offset
> for the first sector
> and if this requirement is valid on certain types of storage only?
>
>
> 3.1.1. Partition the Shared Disks:
>
> 1. Once the LUNs have been presented from the SAN to ALL servers in the
> cluster, partition the LUNs from
> one node only, run fdisk to create a single whole-disk partition with
> exactly 1 MB offset on each LUN to be
> used as ASM Disk.
>
>
>
> Thanks
> Dimitre
>
>
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>

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Received on Mon Feb 13 2012 - 17:00:13 CST

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