User guide

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Glossary–3
Hitachi Unified Storage VM Block Module Hardware User Guide
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