Long time since we had RDMs, I think back then we had to do them at the Windows VM level, present it new disks from the new array and create mirrors in Windows then remove the old disks and LUNs.
If it's an alletra 9k you might be able to use the 3PAR migration tools, can't remember if they support RDMs, they basically mirror the old 3PAR LUN to the Alletra array and do a peer persistence type thing of presenting the Alletra paths as standby and then switch the 3par paths to standby and the Alletra ones to active.
However i think you need to be on at least a 3PAR 8000 with 3.3.2 OS to use that tool.
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