leaf volume
A level-2 secondary volume in a ShadowImage cascade configuration. The primary
volume of a layer-2 pair is called a node volume. See also cascade configuration.
LED
light-emitting diode
license key
A specific set of characters that unlocks an application and allows it to be used.
local copy
See in-system replication.
local storage system)
A storage system at a local site that contains primary volumes of remote replication
pairs. The local system is configured to send remote I/Os to the remote site, which
contain the secondary volumes of the pairs.
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 disk controller (LDKC)
A group of 255 control unit (CU) images in the RAID storage system that is controlled
by a virtual (logical) storage system within the single physical storage system.
logical unit (LU)
A logical volume that is configured for use by open-systems hosts (for example, OPEN-
V).
logical unit (LU) path
The path between an open-systems host and a logical unit.
logical volume
See volume.
LU
logical unit
LUN
logical unit number
LUNM
Hitachi LUN Manager
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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-12
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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