/SPARE=sas_id

    Specifies the disk SAS ID to be added as the Global Hot Spare
    disk. (The SAS ID is the ID displayed when you enter the SAS
    command SHOW DISK.)

    This qualifier is required only when specifying a Global Hot
    Spare disk for a RAID 1 configuration.

    You can configure one Global Hot Spare disk per controller. The
    spare drive can be shared between two RAID 1 IR volume sets per
    controller. The size of the disk specified as /SPARE should be
    equal to or greater than the size of at least one of the physical
    disks on the IR volume.