Specifies the disk numbers to be used as spare disk(s). Multiple
         disks must be enclosed in parenthesis. Assigning a spare disk to
         an unit in a drive group will assign the spare disk to all the
         configured units in the drive group.

         If an unit is created on a disk group to which a spare disk is
         assigned, then the spare disk will be configured to the new unit
         (if it is not a RAID 0 unit). One spare disk can be assigned to
         multiple drive groups.

         Ensure that the size of the spare disk is at least equal to the
         size of the smallest drive in the drive group.

         Format:
                 /SPARE=(disk_number[,...])

         Note: The disk numbers for the existing disks can be obtained
               using the SHOW DISKS command.