Js wrote:
> Thanks to all for prompt reply.
>
> DA Morgan -- Yes, I meant OCFS. Up both the instance -- I heard from
> some one that we can not start both instance at same time. For that we
> need
> shared storage like [SAN,EMC] or on single node where can have normal
> disk which does not support to write on single OS block by two
> processes.
>
> What is diff. in OCFS or ASM.
>
> -- Can you pls. suggest me from where I should start step by step

Single node or 100 nodes you MUST have shared storage which means
you MUST use RAW devices, or OCFS, or another cluster file system
such as NetApp's or Veritas.

OCFS is a file system. ASM is, in a sense, managed raw devices
though ASM is much much more than just that. I'd suggest you
read up on ASM at http://tahiti.oracle.com.
--
Daniel A. Morgan
http://www.psoug.org
damorgan@x.washington.edu
(replace x with u to respond)