NonStop System Glossary

LOW_POWER mode
Memory hold-up mode.
LSU
See logical synchronization unit (LSU).
LSU enclosure
An enclosure that contains one to eight LSUs, a chassis, and AC power distribution.
LSU logic board
The part of the LSU that performs the synchronization functions of the LSU.
LSU optics adapter
The part of the LSU that interfaces to the ServerNet fabric.
LUN
logical unit number (LUN)
M
MAC address
media access control (MAC) address
MAF
See missed address file (MAF).
main bonding jumper
The connection between the grounded circuit conductor and the equipment grounding conductor
at the service.
main memory
Data storage, specifically the chips that store the programs and data currently in use by a processor.
main service entrance
The enclosure containing connection panels and switchgear, located at the point where the utility
power lines enter the building.
maintenance entity
A processing entity in a single NonStop system that collects state information, environmental
information, and failure data about the system resource or resources for which the maintenance
entity is responsible. A maintenance entity can include both physical and software components,
and a system can contain multiple maintenance entities. For example, each I/O adapter module
(IOAM) and processor switch has its own maintenance entity.
Maintenance Interface
See Archive and Database Maintenance Interface.
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