HP XP P9500 Storage - Manual (Page 131)

Glossary
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.
CLPR Cache logical partition.
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.
failover The process that occurs when one device assumes the workload of a failed companion device.
Failovers can be planned or unplanned.
Fibre Channel A data transfer architecture designed for mass storage devices and other peripheral devices that
require high bandwidth.
FICON Fibre connectivity. An FC layer 4 protocol used to map mainframe channel command and data
I/O operations onto standard FC infrastructure, protocol, and FC services.
HDD Hard disk drive.
instance A running copy of RAID Manager. Instances can be local or remote. Multiple instances can run
on the same host.
LDKC Logical disk controller.
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.
MCU Main control unit.
MPB MSL to MicroProcessor Blade
OPEN- x A general term describing any 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, and OPEN-E), and OPEN-V, which has a variable size and is a CVS-based
volume.
P-VOL Primary volume.
parity group A set of hard disk drives that have the same capacity and that are treated as one group. A parity
group contains both user data and parity information, which enables user data to be accessed
if one or more drives in the group is not available.
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)
ports and other port types. Ports are named by port group and port letter, such as CL1-A. CL1 is
the group; A is the port letter.
PSUE Pair suspended-error.
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