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another. A typical switch can facilitate several
simultaneous bandwidth transmissions between different
pairs of nodes.
T
TapeAlert. A patented technology and ANSI standard
that defines conditions and problems that are
experienced by tape drives.
TapeAlert flags. Status and error messages that are
generated by the TapeAlert utility and display on the
server’s console.
tape cartridge. A removable storage case that houses
belt-driven magnetic tape that is wound on a supply reel
and a takeup reel.
tape drive. See IBM TotalStorage LTO Ultrium 2 Tape
Drive.
tape path. Within a tape drive, the channel in which
the media moves.
tapeutil. Created by IBM, a utility program for LTO
devices that connect to all supported servers except
Windows NT and Windows 2000. tapeutil provides
service aids for tape subsystems, offers a menu-driven
tool for exercising or testing IBM tape and medium
changer devices, and includes a command-line interface
that is convenient for use in shell scripts.
terminate. To prevent unwanted electrical signal
reflections by applying a device (known as a terminator)
that absorbs the energy from the transmission line.
terminator. (1) A part that is used to end a SCSI bus.
(2) A single-port, 75- device that is used to absorb
energy from a transmission line. Terminators prevent
energy from reflecting back into a cable plant by
absorbing the radio frequency signals. A terminator is
usually shielded, which prevents unwanted signals from
entering or valid signals from leaving the cable system.
TERMPOWER. Electrical power that is provided by a
device (such as the Ultrium 2 Tape Drive) to a SCSI
terminator so that the SCSI bus can function. To supply
TERMPOWER, a jumper must be placed on pin 1 of the
SCSI ID connector on the Ultrium 2 Tape Drive.
Test Head diagnostic. A test that determines whether
the heads of the Ultrium 2 Tape Drive are operating
properly and whether the drive can correctly read from
and write to tape.
throughput. A measure of the amount of information
that is transmitted over a network in a given period of
time.
topology. In communications, the physical or logical
arrangement of nodes in a network, especially the
relationships among nodes and the links between them.
TotalStorage LTO Ultrium 2 Tape Drive. See IBM
TotalStorage LTO Ultrium 2 Tape Drive.
track. A linear or angled pattern of data that is written
on a tape surface.
transfer rate. See data transfer rate.
two-node arbitrated loop. In Fibre Channel
technology, the connection of two nodes that
communicate directly (without the use of a switch) and
use the same protocol.
two-node switched fabric loop. In Fibre Channel
technology, the connection of two or more nodes that
communicate by using a switch. The nodes may not use
the same protocol.
U
Ultra160 LVD SCSI interface. See Small Computer
Systems Interface.
Ultrium 2 Tape Drive. See IBM TotalStorage LTO
Ultrium 2 Tape Drive.
uniform resource locator (URL). The address of an
item on the World Wide Web. It includes the protocol
followed by the fully qualified domain name (sometimes
called the host name) and the request. The web server
typically maps the request portion of the URL to a path
and file name. For example, if the URL is
http://www.networking.ibm.com/nsg/nsgmain.htm, the
protocol is http; the fully qualified domain name is
www.networking.ibm.com; and the request is
/nsg/nsgmain.htm.
unload. The act (performed by the drive) of
unthreading tape from the drive’s internal tape path and
returning it (with the leader block) to the tape cartridge.
unload button. Located at the front of the Ultrium 2
Tape Drive, a push button that, when depressed,
rewinds the tape in a cartridge and ejects the cartridge
from the drive. The unload button can also be used to
place the tape drive in maintenance mode, scroll
through maintenance functions, exit maintenance mode,
force a drive dump, and reset the drive.
URL. See uniform resource locator.
utility. See utility program.
utility program. A computer program that supports
computer processes. For example, a diagnostic
program, a trace program, or a sort program.
V
Vdc. Volts dc (direct current).
114 IBM TotalStorage LTO Ultrium 2 Tape Drive