| manage-bde -WipeFreeSpace command to transition the volume to full-volume encryption on these types of volumes. This is blocked in order to avoid expanding thinly provisioned volumes to occupy the entire backing store while wiping the unoccupied (free) space |
| Protecting cluster shared volumes and storage area networks with BitLocker (Windows 10) | Microsoft Docs : http://docs.microsoft.com/en-us/windows/security/information-protection/bitlocker/protecting-cluster-shared-volumes-and-storage-area-networks-with-bitlocker |