L
LDEV
logical device
license key
A specific set of characters that unlocks an application and allows it to be used.
logical device (LDEV)
An individual logical data volume (on multiple drives in a RAID configuration) in the
storage system. An LDEV may or may not contain any data and may or may not be
defined to any hosts. Each LDEV has a unique identifier or “address” within the storage
system composed of the logical disk controller (LDKC) number, control unit (CU)
number, and LDEV number. The LDEV IDs within a storage system do not change.An
LDEV formatted for use by open-system hosts is called a logical unit (LU).
logical volume
See volume.
LUN
logical unit number. Sometimes used in place of LU, logical unit.
LUSE
LUN Size Expansion
P
pair
Two logical volumes in a replication relationship in which one volume contains original
data to be copied and the other volume contains the copy of the original data. The copy
operations can be synchronous or asynchronous, and the pair volumes can be located in
the same storage system (in-system replication) or in different storage systems
(remote replication).
pair status
Indicates the condition of a copy pair. A pair must have a specific status for specific
operations. When an operation completes, the status of the pair changes to the new
status.
PDB
power distribution box
PDP
power distribution panel
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Glossary-3
Hitachi Unified Storage VM Block Module Hardware User Guide
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