1 /ADG
Specifies the RAID type for the existing UNIT to be Advanced
Data Guard (ADG). This qualifier should be used only
with the /MIGRATE qualifier to migrate from any existing
RAID level to ADG.
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.
3 /DEL_SPARE
Specifies the spare disks to be removed from use for a unit.
Multiple disks must be enclosed in parenthesis.
Format:
/DEL_SPARE=(disk numbers[,...])
Note: If you delete a spare disk (that is, assigned to more
than one LUNs) from one unit, then the disk specified in
the DEL_SPARE qualifier will be deleted from all the
units in a disk group.
4 /DISKS
Specifies the disks to be used to form the UNIT.
Multiple disks must be enclosed in parenthesis. This qualifier
should be used only in conjunction with the /EXPAND qualifier
to expand the disks used by the existing unit.
Format:
/DISK=(disk numbers[,...])
Note: The disk numbers for the existing disks can be obtained
using the SHOW DISKS command.
5 /EXPAND
Allows the specified logical unit and all units in the disk/
disk group to utilize more disks. The EXPAND command does not
increase the size of the logical unit but it merely adds more
disks, appending extra space on each individual disk.
To increase the size we need to use the "/EXTEND" qualifier
after expanding the unit.
During expansion of units of a drive group the RAID level of
certain units might be changed. For example, if an unit of
RAID level 1 with 2 disks is expanded to 3 disks, then
the RAID level will change to RAID 5 as RAID 1 unit does not
support odd number of disks.
When expanding a unit with other units present on the same set
of drives, all units will undergo volume expansion.
Format:
SET UNIT <Unit_n>/EXPAND/DISK=<diskrange>
where Unit_n = (0-31)
Note:
- Diskrange must include both pre-expand disks and
the additional disks. Examples of diskrange are:
101, (101,112,314,..)
- Only /DISK qualifier should be used in
conjunction with the /EXPAND qualifier
- The disk numbers for the existing disks can be
obtained using the SHOW DISKS command.
6 /EXTEND
Extends or increases the size of an existing logical
unit. To specify a new size for the unit, use the /SIZE
qualifier. The size specified must be greater than the
current unit size. When extending a unit with other units
present on the same set of drives, some units may be
moved (undergo volume expansion) to make space for the
additional size required.
Note that even though the UNIT size increases on
SET UNIT/EXTEND command completing successfully, the
increased size will reflect in OpenVMS only after the
appropriate Dynamic Volume Expansion (DVE) steps such
as SET VOLUME/LIMIT and SET VOLUME/SIZE are executed
successfully at the DCL prompt. For more details, refer
to Chapter 9 on Dynamic Volume Expansion (DVE) in
"VSI OpenVMS System Manager's Volume 1: Essentials manual".
Note: The /SIZE qualifier should be used only in conjunction
with the /EXTEND qualifier.
Format:
SET UNIT <Unit_n> /EXTEND/SIZE=S
where Unit_n = (0-31) s=size in MB or GB (ex:10MB/20GB)
7 /IDENTIFIER
Specifies the unit number to be used by OpenVMS. The value of the
identifier can be between 1 and 9999.
Note: Identifier is not required for Smart Array controllers.
Format:
/IDENT= n
8 /JBOD
Specifies the RAID type to be JBOD. This is also synonymous to
RAID 0.
9 /MIGRATE
Migrates the fault tolerance (RAID) level or Stripe size or both
of an existing logical unit. When migrating a unit with other units
present on the same set of drives, some units may undergo volume
expansion.
Format:
SET UNIT <Unit_n>/MIGRATE [/RAID_LEVEL=R] [/STRIPE_SIZE=S]
where Unit_n = (0-31)
R=(0,1,5)
S=(8,16,32,64,128,256)
Note:
- /ADG or /JBOD can also be used instead of /RAID_LEVEL
- Only RAID level and Stripe size can be modified using
the /MIGRATE qualifier
- Cannot migrate any RAID units (RAID 1, RAID 5 and so on)
that have spare disks to RAID 0 or JBOD units.
10 /RAID_LEVEL
Specifies the RAID type of the UNIT. The supported 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
Note: /RAID_LEVEL should be used only in conjunction
with the /MIGRATE qualifier.
Format:
/RAID=[(0 | 1 | 5 | 50 |60)]
11 /SIZE
Specifies the new size of the UNIT.
Note: The /SIZE qualifier should be used only in
conjunction with the /EXTEND qualifier.
Format:
/SIZE=#(Gb | Mb | Kb | %)
12 /SPARES
Specifies the disk to be designated as the 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.
13 /STRIPE_SIZE
Specifies the new 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. SAS Smart Array Controllers with Firmware
5.0 onwards support 512 KB stripe size with RAID5.
Note: The /STRIPE qualifier can only be used in conjunction
with the /MIGRATE qualifier.
Format:
/STRIPE=(stripe_size)
14 /VERBOSE
Provides logging that can be interpreted by engineering.