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 10.2.0.4.  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 ?

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