Glossary 85
selected emulation mode. The term LDEV is often used synonymously
with the term volume.
LED Light emitting diode.
local disk A disk in the host.
LU Logical unit.
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 Logical unit size expansion. See also Expanded LUN.
m Meters.
MB Megabytes.
MCU Main control unit.
MIX A circuit board in the disk control unit that includes disk adapters and
channel adapters for interfacing disk drives and the host to cache memory.
mirroring
consistency
The consistency (usability) of data in a volume (for example, S-VOL).
mm Millimeters.
MR Magnetoresistive.
ms, msec Milliseconds.
mutual hot standby
system
Two servers that are poised to cover for each other if necessary.
NAS Network attached storage.
node Logically speaking, an environment where instances can be executed.
Physically, a processor, which is an element of a cluster system.
NVS Nonvolatile storage.
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