No, the RLM doesn't work that way.  You can only migrate to a larger array - you can't take away space.
Hello all, I recently ordered a T320 with a Perc H310 controller with two internal SAS hard drives.  Unfortunatly, I made a mistake and ordered the configuration to be Raid 0 instead of Raid 1.  Will I be able to do a Raid Level Migration from Raid 0 to Raid 1 even though the Raid 0 is across two disks?   Thanks!
Perc H310 on PE T320