Does anybody have experience with Red Hat Enterprise Linux 4 and OCFS2 on HP hardware?

I've got an MSA1500cs SATA "SAN Starter Kit," which consists of the MSA1000 controller shelf and the MSA20 SATA disk enclosure, connected to an HP 4/8 SAN switch, connected to Qlogic QLA2312 FC HBAs in the two servers (DL580/G3, 4x Xeon CPUs). I want to use this SAN to create cluster-aware file systems so I can run Oracle RAC 10g on the two servers, and share an Oracle instance between them.

I'm running RHEL4 AS (2.6.9-22.0.2.ELsmp). I installed OCFS2 1.2.0-1, and the ocfs2-tools suite, on both nodes. I used the OCFS2 console tool to create a cluster, following the instructions in the OCFS2 User Guide. The private network interconnect on both systems is working, and the nodes can ping each other through them. I opened up TCP/UDP port 7777 on both nodes and made eth1 (the interconnect interface) a "trusted interface."

From the command line, from either "cluster node," I can create an ext2 or ext3 file system, no problem. But when I try to create an OCFS2 file system, I start getting lots and lots of SCSI errors ("Fatal Drive Error SCSI Port 1 ID 4"). OCFS2 doesn't seem to get along with this SAN hardware.

Has anybody successfully set up an OCFS2 "cluster" using the MSA1500cs SAN hardware for shared storage? Is there anything obvious I've overlooked?

Any advice or suggestions would be very welcome.