1 ADD Format: ADD 2 UNIT ADD UNIT is used to create UNITs (logical storage units comprising of 1 or more hard drives). Format: ADD UNIT / 3 Parameters Unit_n (the unit number can range from 0-31) 3 Qualifiers /ADG Specifies the RAID type for the UNIT as Advanced Data Guard (ADG). /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. /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. /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 /JBOD Specifies the RAID type to be JBOD. This is also synonymous to RAID 0. /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) /RAID_LEVEL Specifies the RAID type of the UNIT. The support values for this qualifier are 0,1 and 5. - RAID 0 is Data Striping - RAID 1 is Disk Mirroring - RAID 5 is Data Striping with Striped Parity Format: /RAID=[(0 | 1 | 5)] /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 | %) /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. /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) /VERBOSE Provides logging that can be interpreted by engineering. 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. 3 Restrictions Any two or a combination of all the following qualifiers cannot be used in conjunction with each other: /RAID_LEVEL, /JBOD, /ADG