RE: AIX Concurrent I/O for Oracle archive logs

From: Allen, Brandon <>
Date: Wed, 26 May 2010 18:09:45 -0700
Message-ID: <64BAF54438380142A0BF94A23224A31E11984C7FBA_at_ONEWS06.oneneck.corp>

Hi Nuno, thanks for the information - we are already using large pages too on one of our systems and planning to implement them on this one as well. Do you have any input regarding my specific question regarding archived logs - have you ever placed them on cio file systems, or can you think of any reason why it would be a problem? We're running 9i in this case so we have to mount the file systems with cio in order to use it. Also, not sure if you've read this updated paper ( from Dennis Massanari, but it has some good information about using the newer, easier to manage, 64K large pages instead of the older 16MB large pages. I haven't tested them out yet, but am planning to soon. Have you had any experience with it yet?

Thanks again,

-----Original Message-----
From: [] On Behalf Of


Well, part of the problem is that turning CIO on by itself is not enough. You also have to tune the memory management with "vmo" to make AIX use less memory for file cache and more for programs/SGA. On the other hand, if you allocate largepages for SGA

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Received on Wed May 26 2010 - 20:09:45 CDT

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