Specifications

GL–12 Glossary
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’s bus connection to communicate on the SCSI bus.
logical unit number 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’s 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.
LRU Least recently used. A cache term used to describe the block replacement policy
for read cache.
Mbps Approximately one million (10
6
) bits per second—that is, megabits per second.
MBps Approximately one million (10
6
) bytes per second—that is, megabytes per second.