HP StorageWorks Disk Array XP operating system configuration guide for Tru64 UNIX XP24000, XP12000, XP10000, v01 (A5951-96066, June 2007)

LDEV Logical device. An LDEV is created when a RAID group is carved into pieces
according to the selected host emulation mode (that is, OPEN-3, OPEN-8,
OPEN-L). The number of resulting LDEVs depends on the selected emulation
mode. The term LDEV is often used synonymously with the term volume.
LUN Logical unit number. A LUN results from mapping a SCSI 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.
For example, a LUN associated with two OPEN-3 LDEVs has a size of 4,693
MB.
LUSE A LUN is normally associated with only a single LDEV. The LUSE feature allows
a LUN to be associated with 1 to 36 LDEVs. Essentially, LUSE makes it possible
for applications to access a single large pool of storage. The LUSE feature is
available when the HP StorageWorks Array Manager product is installed.
OFC Open Fibre Control.
OPEN- x A general term describing any one of the supported OPEN emulation modes (for
example, OPEN-L).
PA Physical address.
path Paths are created by associating a port, a target, and a LUN ID with one or
more LDEVs.
port A physical connection that allows data to pass between a host and the disk
array. The number of ports on an XP disk array depends on the number of
supported I/O slots and the number of ports available per I/O adapter. The XP
family of disk arrays supports Fibre Channel (FC) ports as well as other port
types. Ports are named by port group and port letter, such as CL1-A. CL1 is the
group, and A is the port letter.
RAID Redundant array of independent disks.
R-SIM Remote service information message.
SCSI Small computer system interface.
SIM Service information message.
SNMP Simple Network Management Protocol.
SVP Service processor, which is the PC built into the disk controller. The SVP provides
a direct interface into the disk array. SVP use is reserved for HP support
representatives only.
TID Target ID.
Volume On the XP array, a volume is a uniquely identified virtual storage device
composed of a control unit (CU) component and a logical device (LDEV)
component separated by a colon. For example 00:00 and 01:00 are two
uniquely identified volumes; one is identified as CU = 00 and LDEV = 00, and
the other as CU = 01 and LDEV = 00; they are two unique separate virtual
storage devices within the XP array.
VSC Volume size customization. Synonymous with CVS.
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