This method is disabled by 'moref=vm-ID'

If you get this message when you are trying to Storage Vmotion a VM then this is likely to be a lock in vCentre SQL database for this VM, mostly put in place by the backup system e.g. Netbackup, Veeam etc

Vmware KB 2008957 has all the step to resolve the issue but I found that restarting SQL services is not really required. Carryout all the steps from 1 - 6 and then rerun that backup (incremental is good enough) and then do Storage Vmotion again...

1. Stop the vCenter Services.
2. Take a backup of the vCenter Server database.
3. Run this command against the vCenter Server database.
   
   select * from VPX_VM WHERE FILE_NAME LIKE '%Virtual-Machine-Name%'
   
4. Take note of the numerical ID value returned by the SQL statement in step 3, as this will be required in the SQL statement in steps 5 and 6.
   
5. To confirm the stale entry, run this command against the vCenter Server database:
   
   select * from VPX_DISABLED_METHODS WHERE ENTITY_MO_ID_VAL = 'vm-ID from step 4'
   
6. To remove the stale entry run this command against the vCenter Server database:
   
   delete from VPX_DISABLED_METHODS WHERE ENTITY_MO_ID_VAL = 'vm-ID from step 4'