host One or more computers that generate and communicate data to the device.
hot-plug, hot
swap
The plugging in or removal of a drive into a system with the power turned
on.
HVDS High voltage differential signaling, also called differential SCSI. HVDS
supports cable lengths up to 25 meters.
import The process of placing a cartridge into the cartridge access port so that
the robot can insert it into a storage slot.
inventory The process of reading and storing in memory the bar code identification
and locations of all cartridges in the library.
LAN Local Area Network. A computer network covering a local area, such as
a home, office, or small building, that is usually based on Ethernet
technology.
LCD Liquid crystal display. A type of display that uses two sheets of polarizing
material with a liquid crystal solution.
LED Light emitting diode. An electronic device that lights up when electricity is
passed through it.
LTO An acronym for Linear Tape-Open technology. An “open format”
technology, which means that users will have multiple sources of products
and media.
LUN Logical Unit Number. An address for a component of a SCSI device, similar
to an apartment number. In this device, the host computer sends the SCSI
commands for the library to LUN 1 of the Master tape drive and sends
SCSI commands for the tape drive itself to LUN 0.
LVDS Low Voltage Differential Signaling. A low noise, low power, low amplitude
method for high-speed (gigabits per second) data transmission over copper
wire.
MAC address Media Access Control address. A unique identifier attached to most forms
of networking equipment, which is part of the Ethernet specification.
magazine A removable array that holds cartridges and is placed into the load port of
the tape library.
mailslot All or part of a magazine used to import cartridges into the library.
Megabyte A unit of storage abbreviated as M or MB, equal to 1,024 x 1,024 =
1,048,576 bytes.
MIB Management Information Base. A type of database used to manage the
devices in a communications network.
parallel SCSI A suite of closely related standards in which parallel SCSI devices are
connected in parallel to form busses. Each parallel SCSI standard has its
own bus width, clock speed, maximum throughput, maximum cable length,
and maximum number of devices on the bus.
parallel SCSI
devices
External parallel SCSI devices with two ports, one for the incoming cable
and another for the outgoing cable to the next device. (see daisy chaining).
put An activity in which a robot places a cartridge into a slot or drive.
RAID Redundant Array of Inexpensive Disks. A group of disks that work together
to improve performance. RAID 5 provides some parity protection in case
one of the disks fails.
RMI Remote Management Interface. A web-based interface used to monitor
and control the device. The RMI is a website that is hosted on the device.
robot An electro-mechanical device that transports tape cartridges to and from
the magazines and drives.
robotics unit The unit that includes the robotic components and that controls the
movement of the robot between storage slots, drives, and load ports.
214 Glossary
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