HP XP P9500 Storage - Manual (Page 75)

Glossary
AL Arbitrated loop.
AL-PA Arbitrated loop physical address. A 1-byte value that the arbitrated loop topology uses to identify
the loop ports. This value becomes the last byte of the address identifier for each public port on
the loop.
bit The basic unit of data in a binary numbering system (binary digit), represented by a 0 or a 1.
Eight bits equals one byte.
CLI Command-line interface. An interface comprised of various commands which are used to control
operating system responses.
CLPR Cache logical partition.
Cnt Ac-J P9000 or XP Continuous Access Journal software.
Cnt Ac-J Z The version of Continuous Access Journal that supports mainframe volumes.
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.
emulation mode The LDEVs associated with each RAID group are assigned an emulation mode that makes them
operate like OPEN system disk drives. The emulation mode determines the size of an LDEV or
volume.
OPEN-V: User-defined custom size
3390-3/3R: 2.838 GB
3390-9: 8.514 GB
3390-L: 27.844 GB
3390-M: 55.689 GB
3380-3 2.377 GB
FC-AL Fibre Channel Arbitrated Loop.
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.
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.
PA Physical address.
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
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