Why not use the classic approach: "dd if=old_disk of=new_disk" or something such?
Create a new LUN of exactly the same size as the old one, create a VG and mount it on the first machine, create the copy with simple UNIX means, for example:
cd /mountpoint/of/old_disk
tar -cf - . | (cd /mountpoint/of/new_disk; tar -xf - )
Then unmount and export the VG. Change the zoning to allow access from the second machine (and maybe disallow access from the originating one) and import the VG.
you could set up an lvm mirror, and set the pv state to missing
don't forget to turn the vg quorum off
use chpv
from the man page:
r
Makes a physical volume unavailable (removed) for logical input and output. If the physical volume is required in order to maintain a volume group quorum, an error occurs and the physical
volume remains open.
Examples
1 To close physical volume hdisk03, enter: chpv -v r hdisk03
The physical volume is closed to logical input and output until the -v a flag is used.
then zone it to the other lpar, and remove the disk from the vg