SAS_UTIL_HELP.HLB  —  ADD  UNIT
    Creates a new Integrated RAID (IR) volume.

    An IR volume ID is created whenever an IR volume is created.

    Format

      ADD UNIT /DISK=sas_id (,...) /RAID=1

1  –  Qualifiers

1.1    /CACHE 

       /CACHE
       /NOCACHE (default)

    Enables or disables write caching to the physical disk. Write
    caching to the physical disk is set to off by default.

1.2    /DISK 

       /DISK=sas_id(,...)

    This qualifier is required. Specifies the SAS ID of the physical
    disk to be added to the IR volume set. (The SAS ID is the ID
    shown when you enter the SAS command SHOW DISK.) Enclose multiple
    SAS IDs in parentheses.

    The effective size of the RAID volume is automatically determined
    and set to the maximum size available. The firmware supports
    disks of varying sizes; however, the excess space of a larger
    disk or disks is unusable. Volume expansion is not supported;
    once a volume is created, its size cannot be increased.

    A physical disk must be dismounted in OpenVMS before it can be
    added to the IR volume set.

1.3    /RAID 

       /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).

1.4    /SPARE 

       /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.

1.5    /SYNCH 

       /SYNCH
       /NOSYNCH (default)

    This qualifier applies only to RAID 1 IR volumes. Specifies the
    use of high-priority or low-priority resynchronization. High-
    priority resynchronization is set to OFF by default.

1.6    /UNSAFE 

    Overrides the restriction that limits OpenVMS support to RAID 1
    only.
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