As your storage needs change, you can select to move a disk unit from one disk pool to another disk pool. When you move a disk unit, the server first moves all of the data on that disk unit to other disk units in the original disk pool. You cannot move disk units to or from an independent disk pool. For disk units in system disk pools and basic disk pools, you need to restart your system to dedicated service tools (DST) mode before moving them.
When you remove a disk unit, the server redistributes the data on that disk unit to other disk units in the disk pool. If you want to remove a disk unit from an independent disk pool that is unavailable, you can do so when your system is fully restarted. For all other disk pools, you need to restart your system to DST before removing them.
Depending on disk unit capacity and performance, the move or remove process can take from several minutes to over an hour to complete, potentially affecting system performance.