MSA_UTIL_HELP.HLB  —  ADD
           Format:
                   ADD <parameter>

1  –  UNIT 

           ADD UNIT is used to create UNITs (logical storage units
           comprising of 1 or more hard drives).

           Format:
                   ADD UNIT <unit_n> / <qualifiers>

1.1  –  Parameters 

          Unit_n (the unit number can range from 0-31)

1.2  –  Qualifiers

1.2.1    /ADG 

         Specifies the RAID type for the UNIT as Advanced Data Guard (ADG).

1.2.2    /CACHE 

         Determines whether the controller's cache should be used for the
         UNIT. Caching is ON by default. To disable caching, use a /NOCACHE
         qualifier with SET UNIT or ADD UNIT commands.

1.2.3    /DISK 

         Specifies the disk numbers to be used to form the UNIT. Multiple
         disks must be enclosed in parenthesis.

         Format:
                 /DISK=(disk numbers[,...])

         Note: The disk numbers for the existing disks can be obtained
               using the SHOW DISKS command.

1.2.4    /IDENTIFIER 

         This is the user-defined identifier for the unit. This identifier
         is used by OpenVMS to name the device. The value of the identifier
         can be between 1- 9999

         Note: Identifier is not required for Smart Array Controllers.

         Format:
                 /IDENT= n

1.2.5    /JBOD 

         Specifies the RAID type to be JBOD. This is also synonymous to
         RAID 0.

1.2.6    /PARTITION 

         Specifies the partition number to be used for a given UNIT. The
         first unit that is created on a disk/disk group will automatically
         be assigned the partition number 0. The units that are subsequently
         created on this disk/disk group will need to be created with partition
         numbers in a sequential order.

         Format:
                 /PART=(partition_number)

1.2.7    /RAID_LEVEL 

         Specifies the RAID type of the UNIT. The support values for this
         qualifier are 0, 1, 5, 50, and 60.

         -  RAID 0 is Data Striping
         -  RAID 1 is Disk Mirroring
         -  RAID 5 is Data Striping with Striped Parity
 	-  RAID 50 is Data Striping across RAID 5 arrays
 	-  RAID 60 is Data Striping across RAID 6 arrays

         Format:
                 /RAID=[(0 | 1 | 5 | 50 | 60)]

        Note:

        - When minimum four disks are supplied to create a RAID 1 unit,
          the controller creates a RAID 10 unit; which is Data Striping
          across RAID 1 arrays.

        - SHOW UNITS displays "Logical Volume Raid Level: RAID 1" for the
          RAID 10 units. If the data disks used by logical unit number (LUN)
          are more than two disks, the implementation of that LUN is
          RAID 10.

1.2.8    /SIZE 

         Specifies the size of the UNIT. When the size qualifier is
         not specified, the size defaults to the Maximum capacity of
         the disks depending on the RAID level.

         Format:
                 /SIZE=#(Gb | Mb | Kb | %)

1.2.9    /SPARES 

         Specifies the disk numbers to be used as spare disk(s). Multiple
         disks must be enclosed in parenthesis. Assigning a spare disk to
         an unit in a drive group will assign the spare disk to all the
         configured units in the drive group.

         If an unit is created on a disk group to which a spare disk is
         assigned, then the spare disk will be configured to the new unit
         (if it is not a RAID 0 unit). One spare disk can be assigned to
         multiple drive groups.

         Ensure that the size of the spare disk is at least equal to the
         size of the smallest drive in the drive group.

         Format:
                 /SPARE=(disk_number[,...])

         Note: The disk numbers for the existing disks can be obtained
               using the SHOW DISKS command.

1.2.10    /STRIPE_SIZE 

          Specifies the stripe size for a given RAID volume. Stripe size
          must be one of 8, 16, 32, 64, 128, and 256 values. Raid 5 and ADG
          are limited to a maximum 64 KB stripes. RAID 0 and 1 default to 128
          KB stripes, and RAID 5 and ADG default to 16 KB stripes.
          SAS Smart Array Controllers with Firmware 5.0 onwards support
          512 KB stripe size with RAID5.

          Format:
                  /STRIPE=(stripe_size)

1.2.11    /VERBOSE 

          Provides logging that can be interpreted by engineering.

1.3  –  Examples 

           - ADD UNIT 3/ID=1003/DISK=103/JBOD/PARTITION=0/SIZE=8GB
           - ADD UNIT 4/ID=1004/DISK=103/JBOD/PARTITION=1/SIZE=10GB
           - ADD UNIT 5/ID=1005/DISK=103/JBOD/PARTITION=2/SIZE=8GB

           In the above-mentioned examples, 3 units are being created on disk
           103. Notice that the partition numbers are provided in sequential
           order on the same disk/disk group.

           Consider the following command sequence:

           - ADD UNIT 3/ID=1003/DISK=103/JBOD/PARTITION=0/SIZE=8GB
           - ADD UNIT 4/ID=1004/DISK=103/JBOD/PARTITION=2/SIZE=10GB

           Assuming that there is no unit with partition number '1' on this
           disk, the creation of unit 4 will fail since the unit is assigned
           the partition number '2' and the assignment is not in sequential
           order.

1.4  –  Restrictions 

                 Any two or a combination of all the following qualifiers
                 cannot be used in conjunction with each other:

                 /RAID_LEVEL, /JBOD, /ADG
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