I've heard that LVM manages physical slices by device name (/dev/sdX), not disk ID and that since multipathd increments device names (/dev/sdc becomes /dev/sdd) that LVM gets confused and requires a vgscan and vgchange -a y between a remount. I'll try for myself sometime.
Update QLogic has a forum post on failover and LUNs discussing the redundant devices and more information about what they mean.
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