RE: RedHat GFS and 10g poor performance

From: Matthew Zito <>
Date: Wed, 4 Feb 2009 10:38:38 -0500
Message-ID: <>


It's probably lock-related, if the SAN appears fine. What's your GULM configuration look like?  


[] On Behalf Of Crisler, Jon Sent: Wednesday, February 04, 2009 10:32 AM To: ORACLE-L
Subject: RedHat GFS and 10g poor performance  

Subtitle- Tuning GFS for 10g ?  

I am in the final testing stages of a RedHat 5.1 active / passive cluster, using GFS and The database is fairly large. I am seeing very poor performance, apparently due to disk i/o issues and I cannot pin it down to the cause. Its connected via 4gb SAN, and AWR is reporting datafile service times that range from 10ms to over 80ms, which is very poor. However, the backend SAN is reporting much better service times.  

Disk I/O seems to be far worse than a non-GFS system- perhaps up to 10 times worse. My feeling is that it is something odd with GFS. Has anybody run into performance problem with 10g on GFS ?

Received on Wed Feb 04 2009 - 09:38:38 CST

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