While on the subject, I found instructions on Using Device-Mapper Multipath in Red Hat's RHEL 4 update 6 (4u6). May help getting it to work with 4u5 too, or help decide if you should update...
Update: here is a guide for RHEL 5, update 1 (PDF)
Update: here is a guide for RHEL 5, update 1 (PDF)
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