Glossary - HP StorageWorks P9000 User Manual

Glossary

allocation The ratio of allocated storage capacity versus total capacity as a percentage. Allocated storage
refers to those logical devices (LDEVs) that have paths assigned to them. Allocated storage capacity
is the sum of the storage of these LDEVs. Total capacity is the sum of the capacity of all LDEVs
on the disk array.
CHA Channel adapter. A device that provides the interface between the array and the external host
system. Occasionally, this term is used synonymously with the term channel host interface processor
(CHIP).
CLI Command-line interface. An interface comprised of various commands which are used to control
operating system responses.
command device A volume in the disk array that accepts Continuous Access, Business Copy, or P9000 for Business
Continuity Manager control operations, which are then executed by the array.
CU Control Unit. Used to organize the storage space attached to the disk controller ( DKC). You can
group similarly configured logical devices (LDEVs) with unique control unit images (CUs). CUs
are numbered sequentially. The disk array supports a certain number of CUs, depending on the
disk array model. Each CU can manage multiple LDEVs; therefore, both the CU number and the
LDEV number are required to identify an LDEV.
DKC Disk controller.
HBA Host bus adapter.
HORCM_CMD A section of the RAID Manager instance configuration file that defines the disk devices used as
command devices by RAID Manager to communicate with the disk array.
HORCM_DEV A section of the RAID Manager instance configuration file that describes the physical volumes
corresponding to the paired volume names.
HORCM_INST A section of the RAID Manager instance configuration file that defines how RAID Manager groups
link to remote RAID Manager instances.
HORCM_MON A section of the RAID Manager instance configuration file that describes the host name or IP
address, the port number, and the paired volume error monitoring interval of the local host.
instance A running copy of RAID Manager. Instances can be local or remote. Multiple instances can run
on the same host.
instance A RAID Manager file that defines the link between a volume and a RAID Manager instance. This
configuration file file consists of five sections: HORCM_MON, HORCM_CMD, HORCM_DEV, HORCM_LDEV, and
HORCM_INST.
local instance The RAID Manager instance currently being configured or the instance to which commands are
issued.
LUN Logical unit number. A LUN results from mapping a logical unit number, port ID, and LDEV ID to
a RAID group. The size of the LUN is determined by the emulation mode of the LDEV and the
number of LDEVs associated with the LUN.
LUSE Logical Unit Size Expansion. The LUSE feature is available when the HP StorageWorks LUN
Manager product is installed, and allows a LUN, normally associated with only a single LDEV,
to be associated with 1 to 36 LDEVs. Essentially, LUSE makes it possible for applications to access
a single large pool of storage.
MU Mirror unit.
OPEN- x A general term describing any one of the supported OPEN emulation modes (for example,
OPEN-E. There are two types of OPEN-x devices: legacy OPEN-x devices with a fixed size (such
as, OPEN-3, OPEN-8, OPEN-9, OPEN-E), and OPEN-V, which has a variable size and is a CVS
based volume.
path A path is created by associating a port, a target, and a LUN ID with one or more LDEVs. Also
known as a LUN.
port A physical connection that allows data to pass between a host and the disk array. The number
of ports on a disk array depends on the number of supported I/O slots and the number of ports
available per I/O adapter. The P9000 and XP family of disk arrays supports Fibre Channel (FC)
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