why are you trying to migrate it another LUN ? If you look at Celerra forums you will see folks from EMC recommend not to use LUN Migrator as it could cause diskmark issues.
Hello all,  I know that a Lun in a storage group (NAS storage group) can be migrated using Lun Migration (at least i think so applying the theory). Now my concern is the behavior of the NAS. Because the NAS take the lun and assign a disk,volume, slice and such.   So if a migrate a LUN of 300GB to a LUN of 600GB what happen with the extra space on the NAS, the NAS just make a new structure for the new space and apply it to the storage pool?  Is there any documentation regarding this subject?  Any information or clarification on this matter will be greatly appreciated.  Regards.
Can i migrate a LUN on a NAS using Lun Migration