topic Re: LUN Presentation in General

LUN Presentation

Jim Paulsen — Tue, 05 Jun 2007 12:30:40 GMT

I am in discussion with a co-worker about LUN presentations and the issues with presenting to same LUN to two different servers without any type of clustering but I can't seem to find any documentation on why not to present the same LUN to two servers. If any one knows of any docs that may help, please post and Thanks in Advance...

Re: LUN Presentation

John Tecchio — Tue, 05 Jun 2007 12:50:25 GMT

Jim,
The HP SAN Design Guide usually has a section in the back of the document on Best Practices. You should find what you need there.
In my opinion, without clustering software, you will risk data corruption on the LUN if it is being shared simultaniously between servers. The cluster operation controls these functions and does not allow simulatanious LUN access for Read and Write operations.

click for SAN Design Guide link here:

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00403562/c00403562.pdf

Re: LUN Presentation

Jim Paulsen — Tue, 05 Jun 2007 12:57:37 GMT

Under XP VA storage - Number 11. EXACTLY what I was looking for. I agree about the LUN contention - but it's difficult to discuss without proving a concept or without documentation. Excellent - Thanks - Points coming your way... JIMP sends...

Re: LUN Presentation

John Tecchio — Tue, 05 Jun 2007 13:18:43 GMT

My pleasure.

Thanks Jim

Re: LUN Presentation

Brandon M Estes — Tue, 05 Jun 2007 18:12:57 GMT

Try it in a test enviroment, You wont like it :)

The only time you would ever want to do that is in the staging phase of a server migration and you would not want any type of filesystem IO to occur on the "new" server until you were ready to cut over