Compaq StorageWorks HSG60 ACS Solution Software V8.6 for Compaq Tru64 UNIX Installation and Configuration Guide

Glossary–10 HSG60 ACS Solution Software Version 8.6 for Compaq Tru64 UNIX Installation and Configuration
Guide
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 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.
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.
maintenance
terminal
An EIA-423-compatible terminal used with the controller. This terminal is
used to identify the controller, enable host paths, enter configuration
information, and check the controller status. The maintenance terminal is not
required for normal operations.
See also local terminal.
member A container that is a storage element in a RAID array.