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

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 unit
Commonly called a LUN (which is properly the acryonym for logical unit number). A
physical or virtual device addressable through a target ID number. Logical units use the target
bus connection to communicate on the SCSI bus. The host sees a virtual disk as a logical unit.
logical unit number (LUN)
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.
3. LUN is commonly used in reference to a logical unit.
loop
See arbitrated loop.
LUN
See logical unit number (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 to a network
and that works with the network operating system to control the flow of information over the
network.
HP ProLiant Cluster HA/F500 for Enterprise Virtual Array Setup and Installation Guide Glossary-5
HP CONFIDENTIAL
Writer: Bill Akers File Name: g-glossary
Codename: 49ers II Part Number: 323454-001 Last Saved On: 3/20/03 11:16 AM