User's Guide

Glossary
Scalar i500 User’s Guide 545
FRU (Field Replaceable Unit)
The smallest hardware component that can
be replaced at a customer installation by a certified field service
representative.
G
Gb E or GigE (Gigabit Ethernet)
A transport protocol used for
transmitting data across traditional LANs. GigE is an enhanced
version of the Ethernet protocol that has been used for many
years as the underlying transport technology in IP networks.
GUI (Graphical User Interface) A computer environment that provides a
visual view of a system by incorporating windows, icons, menus,
and a pointing device. Also referred to as a Windows, Icons,
Mouse, and Pointers (WIMP) interface.
H
HAT (Host Access Table) The HP FC Storage Networking drive saves
current and previously logged-in host information in a Host
Access Table (HAT). An entry is a combination of a host’s
WWPN and the drive’s FC port to which it is connected. Host
information is stored and maintained in the HAT until filled up,
in which case the oldest unused entry is freed to allow a new host
to get registered in the HAT.
HDD (High Density Drive) A drive that contains increased storage
capacity of bits and/or tracks per square inch.
Home position Accessor axes positioned at 0 vertical and 0 horizontal,
that serve as the point of reference for the position of other
library components. Home position is used as a basis for
calibration.
Host In general, a host is a computer or program that contains data
and provides services to other computers or devices. In Fibre
Channel terms, a host is a computer that initiates contact with
storage devices.
Hot swappable The ability to replace a defective component while the
system continues to function normally.
HTTP (Hypertext Transfer Protocol) The communication rules by which a
Web browser (client) and a server delivering Web pages
exchange information.
I
I/E (Import/Export or Insert/Eject)
The movement of data or hardware in
and out of processing and storage systems.