- Extend, Migrate and Expand commands will fail if the controller cache is bad or the cache battery is less than 75%. These commands will work on controllers that are designed to support volume expansion by using disk drives for backing up expand data stripe. This is in the absence of battery backed memory on the controller. - RAID units that have spare disks (RAID 1, RAID 5 and so on) cannot be migrated to RAID 0 or JBOD units. - Multiple capacity disks can be used by specifying the "/SIZE" qualifier. The maximum value of size specified with the "/SIZE" qualifier should be the size available on the disk with the lowest capacity.