storage vmotion ?

i cannot do storage vmotion with the physical rdms. it only relocates the mapping file.

here is one discussion, i guess no sVmotion for physical mode RDM.

http://communities.vmware.com/message/1987734

Are the two new LUNs on the same array?

What type of arrays ? (source and target)

no. they are different array types

clariion rdm to netapp rdm

Sancopy is not supported between CX and Netapp so you will need to rely on host based tool.

Do you need the LUNs to stay as RDM or would it be OK if the LUN is a vmdk?

If RDM is not required you can shut down the VM, remove the pRDMs, re-add the LUNs as vRDM and storage vMotion the LUNs. When you storage vMotion the LUN it will convert it from a vRDM to a vmdk.