/SPARE=sas_id

    Specifies the SAS ID of the physical disk to be added as the
    Global Hot Spare disk.

    This qualifier is required 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
    greater than or equal to the size of at least one of the physical
    disks on the IR volume.