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Hitachi VSP User and Reference Guide
Glossary–4
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 mainframe hosts is called a logical volume
image (LVI). An LDEV formatted for use by open-system hosts is called
a logical unit (LU).
logical volume
See volume.
logical volume image (LVI)
A logical volume that is configured for use by mainframe hosts (for
example, 3390-9).
LUN
logical unit number
LUSE
LUN Size Expansion
LVI
See logical volume image (LVI).
M
mirror
In Universal Replicator, each pair relationship in and between journal
groups is called a “mirror”. Each pair is assigned a mirror ID when it is
created. The mirror ID identifies individual pair relationships between
journal groups.
modify mode
The mode of operation of Storage Navigator that allows changes to the
storage system configuration. See also view mode.
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
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