Re: Concurrency Issues with ASM on CX500/EMC and RAC

From: NetComrade <netcomradeNSPAM_at_bookexchange.net>
Date: Thu, 11 May 2006 15:00:34 -0400
Message-ID: <id2762lroiq3fod9v01rep3nn7p1dp6anm@4ax.com>

On 1 May 2006 12:16:11 -0700, andkovacs_at_yahoo.com wrote:

>We are having some sort concurrency issue in our RAC environment using
>ASM.
>Database and ASM are running Oracle EE 10.2.0.2
>
>We have 3 LUNs set up on our CX500 for data.
>ASM is handling these LUNs for the RAC environment.
>
>When we read the LUNs on a single node the performance is around
>90MB/s.
>When we read the same LUN (but different blocks) from a second node the
>performance drops down to 10MB/s.
>
>It seem that either ASM or the CX500 is not able to handle concurrent
>requests to the same LUN.
>
>When we have two processes reading the same LUN from the same server
>the performance is around 130MB/s!
>
>Is there somebody who had similar issues with ASM or a CX500 ?

EMC should have white papers on CX and Oracle RAC. I am also pretty sure you have EMC support. Call 'em.

-A
.......
We run Oracle 9.2.0.6 on RH4 AMD
we are currently looking for a DBA
remove NSPAM to email Received on Thu May 11 2006 - 14:00:34 CDT