Jim, from symmetrix array conrols cli product guide,  You cannot migrate protected devices to an unprotected protection type. Migrations of unprotected source devices to unprotected target are supported.    You cannot migrate to the same protection type (RAID 5 (3+1) to RAID 5 (3+1) and the same disk group number (disk group 1 to disk group 1). The desired protection type or disk group number must be different from what exists on the source devices.     Device types not supported: • VDEVs (TimeFinder Snap) • Thin devices • DATA devices • Vault devices/SFS/VCM • SAVE devices  Hope this answers. 
I am trying to understand the capabilities and limitations of lun migrations on the VMAX. Under the Tasks tab in SMC 7.1, I run the Lun Migration Wizard but it seems to only allow me to perform a lun migration if I am moving the source to a different protection type. Ie: if I have a 25GB Raid 5 lun, it won't let me migrate it to a different raid5 lun but will allow me to migrate it to a Mirrored lun because it's a change in Protection type.  I'm trying to accomplish migrating a smaller lun to a larger lun with the same protection type (similar to what I can do in Navisphere on CX3/4 arrays).  Am I missing something or is this a limitation on VMAX and SMC?  Thanks.  Jim
SMC and VMAX Lun Migration question