Compaq ProLiant Cluster HA/F500 for Enterprise Virtual Array Setup and Installation Guide

Glossary
ProLiant Cluster HA/F500 for Enterprise Virtual Array Setup and Installation Guide Glossary-5
COMPAQ CONFIDENTIAL
Writer: Woody Jernigan File Name: h-glossary
Codename: 49er Part Number: 268374-002 Last Saved On: 5/28/02 3:10 PM
local terminal
A terminal plugged into the EIA-423 maintenance port located on the front bezel of the
controller. See also maintenance terminal.
logical unit (LUN)
A physical or virtual device addressable through a target ID number. LUNs use the target bus
connection to communicate on the SCSI bus. The host sees a virtual disk as a LUN.
logical unit number
1. A value that identifies a specific logical unit belonging to a SCSI target ID number.
2. A number associated with a physical device unit during the I/O operations of a task. Each
task in the system must establish its own correspondence between logical unit numbers
and physical devices.
loop
See arbitrated loop.
LUN
See logical unit (LUN).
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. See also local terminal.
multibus
A dual controller, dual adapter, storage subsystem configuration in which both controller-
adapter I/O paths have access to separate logical units (LUNs). Also known as active/active.
NIC
Network Interface Controller. A board that allows a computer to be connected with a network
and that works with the network operating system to control the flow of information over the
network.
node
An individual server in a cluster.