Select the individual disks you want to use by scrolling through the box of available disks. You must select at least two disks (one data disk and one parity disk) for RAID-4 and at least three disks (one data disk, a regular parity disk, and a double-parity disk) for RAID-DP.
If local synchronous mirroring is enabled, you must select an equal number of disks from each disk pool.
Note: To keep you from accidentally using the last spare, you cannot select all the disks at once. To select all the available disks, use the command-line interface.