List of disks — Adds disks where a list of disk ID numbers are separated by commas. If the -roption is not defined, the disks are added as global spares.

Controllers — Identifies which controller the disks are with so that the disk can be identified and added. Whenever the specific disks are not specified, this option specifies the controller to use.

Number of disks — The number of disks to be added as spares. The tool chooses from the available disks. If not enough disks are available to match the number, the command fails. If the -r command option is not defined, the disks are added as global spares.

RAID volume ID number — If a RAID Volume ID is specified, the spares should be added as dedicated spares for this RAID Volume. Note that some controllers do not support dedicated spares and the command may fail because of this reason.