/RAID=(0 | 1 | 10)

    This qualifier is required. Specifies the RAID level of the IR
    volume set.

    RAID levels are the following:

    RAID Level     Description

    RAID 0         Integrated Striping
    RAID 1         Integrated Mirroring
    RAID 10        Integrated Mirroring Enhanced

                                   NOTE

       OpenVMS Version 8.3 supports RAID 1 (Integrated Mirroring).