poor OCFS performance under Linux

I'm having tough time getting good IO performance utilizing OCFS under Linux.

I have two x86 servers using QLA2100 cards against a 7 disk fibre array configured with software raid-0. The servers are running RHAS 3.0 2.4.21-4.EL, Oracle is 9.2.0.4, and OCFS is 1.0.10-1. OCFS was created with:
mkfs.ocfs -F -b 128 -L /var/opt/oracle/oradata/orcl -m /var/opt/oracle/oradata/orcl -u `id -u oracle` -g `id -g oracle` -p 0775 /dev/md0

I imported a 4 gig table and a count(*) utilizing a full table scan against it executed in about 120 seconds. Other operations big IO operations, (create datafiles, imports, intensive queries) ran slowly, with top indicating about 80% IO wait time.

I configured another database (single node) with identical hardware/OS/Oracle/OCFS, utilizing EXT2 and the same query ran in 30 seconds (same execution plan) and everything was far quicker. For kicks, I reformatted the datafile partition to OCFS and things were back to running slow on this single node environment. OCFS seems to be the weak link here, or at least my implementation of it.

I must be missing something, but scouring the Metalink groups and Google didn't come up with anything that's helped...

Many thanks,
Benjamin Received on Wed Mar 17 2004 - 16:08:42 CST