ASM and disk partitions offset

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



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