1  ADD
 

2  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
 

3  Qualifiers
 

/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.
 

/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.
 

/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).
 

/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.
 

/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.
 

/UNSAFE

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