HSG80 ACS Solution Software Version 8.7 for Compaq Tru64 UNIX Installation and Configuration Guide

Glossary
Glossary–12 HSG80 ACS Solution Software Version 8.7 for Compaq Tru64 UNIX Installation and
Configuration Guide
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A connection between two Fibre Channel ports consisting of a transmit
fibre and a receive fibre.
local
connection
A connection to the subsystem using either its serial maintenance port
or the host SCSI bus. A local connection enables you to connect to one
subsystem controller within the physical range of the serial or host
SCSI cable.
local terminal
A terminal plugged into the EIA-423 maintenance port located on the
front bezel of the controller. See also maintenance terminal.
logical bus
A single-ended bus connected to a differential bus by a SCSI bus signal
converter.
logical unit
A physical or virtual device addressable through a target ID number.
LUNs use their target bus connection to communicate on the SCSI bus.
logical unit
number
LUN. A value that identifies a specific logical unit belonging to a SCSI
target ID number. A number associated with a physical device unit
during a task I/O operations. Each task in the system must establish its
own correspondence between logical unit numbers and physical
devices.
logon
Also called login. A procedure whereby a participant, either a person or
network connection, is identified as being an authorized network
participant.
loop
See arbitrated loop.
loop_ID
A seven-bit value numbered contiguously from zero to 126-decimal
and represent the 127 legal AL_PA values on a loop (not all of the 256
hex values are allowed as AL_PA values per FC-AL.)
loop tenancy
The period of time between the following events: when a port wins
loop arbitration and when the port returns to a monitoring state.
L_Port
A node or fabric port capable of performing Arbitrated Loop functions
and protocols. NL_Ports and FL_Ports are loop-capable ports.
LUN
See logical unit number.
LRU
Least recently used. A cache term used to describe the block
replacement policy for read cache.