From: Bill Verzal (BVerzal@KOMATSUNA.COM)
Date: Wed Sep 03 2003 - 11:43:28 EDT
What is your LVM readahead set to ?
ioo -o maxpgahead -o j2_maxPageReadAhead
BV
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Bill Verzal
AIX Administrator, Komatsu America
(847) 970-3726 - direct
(847) 970-4184 - fax
|---------+-------------------------------->
| | "Hunter, Mark" |
| | <Mark.Hunter@ANHEUSER|
| | -BUSCH.COM> |
| | Sent by: IBM AIX |
| | Discussion List |
| | <aix-l@Princeton.EDU>|
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| | 09/03/2003 10:23 AM |
| | Please respond to IBM|
| | AIX Discussion List |
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>-------------------------------------------------------------------------------------------------------------------------------|
| |
| To: aix-l@Princeton.EDU |
| cc: |
| Subject: aix 5.2, oracle 9.2 and mount with CIO option |
>-------------------------------------------------------------------------------------------------------------------------------|
Any one have any experience with concurrent access mounted directory for
Oracle
databases?
AIX 5.2 with Maint level 1.
4 way striped logical volumes with 64K stripe size.
A simple dd if=/dev/zero of=filename bs=4096 runs incredibly slow. IBM's
whitepaper on this indicates I should see very good performance.
The actual database runs about 30% slower than with normal, cached I/O.
Mark Hunter
Anheuser-Busch Cos.
MIS Consultant, Computer Services
*Office: (314) 632-6663
*Fax: (314) 632-6901
*Pager: (314) 841-4026
*Email: Mark.Hunter@Anheuser-Busch.com
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