RE: Async I/O config/tuning on Linux

  • From: "Herring Dave - dherri" <Dave.Herring@xxxxxxxxxx>
  • To: <hkchital@xxxxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
  • Date: Thu, 24 Jul 2008 13:55:49 -0500

Hemant,

We have pretty much the same (10.2.0.3, 64bit, RHEL AS4).  We have
aio-max-nr set to 3145728 and aio-nr at 74752.  We're waiting on
approval to apply the same patch, to resolve the same problem.  Not sure
if this helps.

Dave
___________________________________

Dave Herring, DBA |   A c x i o m  M I C S / C S O

630-944-4762 office | 630-430-5988 wireless | 630-944-4989 fax

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Hemant K Chitale
Sent: Thursday, July 24, 2008 10:26 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: Async I/O config/tuning on Linux


We get occassional "WARNING:ORACLE PROCESS RUNNING OUT OF OS KERNEL 
I/O RESOURCES (1) " messages in a test environment (10.2.0.2, 64bit, 
RHEL AS4) where we are testing Async IO Patch #6836997  .  This patch 
contains the fix for Bug#6087207 and other Async IO bugs.
We are also considering applying the Patch for Bug#6656824 (DBWR 
crashes after one-off fix for 6087207).

However, what Linux parameters should also be tuned ?  aio-max-size 
doesn't exist in RHEL 4 .  What values should "aio-max-nr" and 
"aio-nr" be configured for ?


Hemant K Chitale
http://hemantoracledba.blogspot.com

"A 'No' uttered from the deepest conviction is better than a 'Yes' 
merely uttered to please, or worse, to avoid trouble."
Mohandas Gandhi Quotes 
:  http://www.brainyquote.com/quotes/authors/m/mohandas_gandhi.html

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