Service Manual

472 Glossary
home position
Accessor axes positioned at 0 vertical and 0 horizontal, which 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/E (import/export, generally replacing insert/eject)
The movement of data or hardware in and out of processing and storage systems.
I/E slot
Import/export slot. A bin that contains a single piece of media in the I/E station.
I/E station
Import/export station. A door on the front of the library that contains tape magazines, into which cartridges
to be imported are placed manually or cartridges to be exported are placed by the picker.
interoperability
The capability of two or more hardware devices or two or more software routines to work together.
IP (Internet Protocol)
A protocol that specifies the formats of packets and addresses. Addresses are formulated as four groups of
2 or 3 digit numbers separated by periods, such as 255.255.255.255 (IPV4). The newer IPV6 standard uses
8 groups of 16 bits each. Each group is written as 4 hexadecimal digits, and the groups are separated by
colons (:). The address 2001:0db8:0000:0000:0000:ff00:0042:8329 is an example of this representation.
kernel
The heart of the UNIX operating system. The kernel is the part of the operating system that allocates
resources and controls processes. The design strategy has been to keep the kernel as small as possible
and to put the rest of the UNIX functionality into separately compiled and executed programs.
key server
A server (computer) that receives, stores, and provides encryption/decryption keys for a specified
encryption type.
L_Port (loop port)
A port that has the capability to communicate only over FC-AL hubs and through FL_Ports.
LED (light emitting diode)
The mode of data transmission for multimode cables with short wave optical transceivers. Single-mode
cables, by comparison, use high powered, long wave lasers.
LME (Library-Managed Encryption)
An encryption method that allows the library to manage the interaction with the encryption-capable tape
drive. LME does not require any independent software support and is transparent to the application.
library
A large-scale tape device with robotics that can house multiple tape drives and a significant amount of tape
cartridges.
library control module
See control module
.
license key
An alphanumeric code that makes a locked feature available. For example, a license key can be applied to
the library to enable unlicensed slots.