This sounds like asking for trouble: if somehow two machines concurrently access the volumes it will result in corrupted filesystems, probably even if not both systems actually write to the disk. I remember reading the HACMP scripts for taking over the shared volumes from one cluster node to another once (back in the days when disks were SCSI or SSA) and they were an absolute nightmare of low-level device manipulation to avoid such problems.

Verify you really really always access the LUNs only from one system at a time.

I hope this helps.

bakunin