HP XP P9500 Storage - Manual (Page 66)

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.
M-VOL Main volume.
MCU Main control unit.
MPB MSL to MicroProcessor Blade
MU Mirror unit.
ORM Online Read Margin
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.
PAV Parallel access volume.
PCB Printed circuit board.
PDEV Physical device.
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.
R-VOL Remote volume.
RAID level A configuration of disk drives that uses striping, mirroring, and parity to improve performance
and data availability and reliability.
RAID Manager The CLI configuration and replication tool for the P9000 or XP disk array that system administrators
can use to enter RAID Manager commands from open-system hosts to perform Continuous Access,
Business Copy, Database Validator, and Data Retention operations, as well as provisioning
commands on logical devices.
RCU Remote control unit.
Remote Web
Console A browser-based program installed on the SVP that allows you to configure and manage the disk
array.
RIO Remote I/O.
RM HP StorageWorks RAID Manager.
S-VOL Secondary or remote volume. The copy volume that receives the data from the primary volume.
SAS Serial Attached SCSI.
SCP State-change-pending.
SIM Service information message.
SMPL Simplex.
SSB Sense byte.
SSD Solid state disk. A high-performance storage device that contains no moving parts. An SSD
contains DRAM or EEPROM memory boards, a memory bus board, a CPU, and a battery card.
SVP Service processor. A computer built into a disk array. The SVP, used only by an HP service
representative, provides a direct interface to the disk array.
66 Glossary