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Fibre Channel protocol. An evolving ANSI
interconnection standard for high-speed data transfer
among computers and storage devices defined by the
Fibre Channel Protocol (FCP). At the physical level,
data is transmitted serially over pairs of point-to-point
links between FC ports. With appropriate components,
data can be transferred at 100 MB/sec up over a
distance of 10 km between FC ports. The ports can be
configured in ring and switched interconnect topologies
which allow each port to exchange data with any other
port that is part of the same fabric.
Fibre Channel wrap test. A diagnostic that causes the
Ultrium 2 Tape Drive to perform a check of the Fibre
Channel circuitry from and to the drive’s Fibre Channel
connector or the fiber cable.
field microcode replacement tape. A tape cartridge
that contains new or revised firmware (microcode) for
the Ultrium 2 Tape Drive.
file. A named set of records that are stored or
processed as a unit.
filemark. Located on the magnetic tape within a tape
cartridge, a recorded element that typically marks the
organizational boundaries in a serial file structure (such
as directory boundaries) and that is requested to be
written or read by the server.
firmware. The proprietary code that is usually
delivered as part of an operating system. Firmware is
more efficient than software that is loaded from an
alterable medium, and is more adaptable to change
than pure hardware circuitry. An example of firmware is
the Basic Input/Output System (BIOS) in read-only
memory (ROM) on a PC motherboard.
FMR tape. See field microcode replacement tape.
foot. A unit of length comprising 12 inches.
G
Gb. See gigabit.
GB. See gigabyte.
Generation 1. The informal name for the IBM Ultrium
Internal Tape Drive, which is the predecessor of the
Ultrium 2 Tape Drive (Generation 2). The Generation 1
drive has a native storage capacity of up to 100 GB per
cartridge and a native sustained data transfer rate of 15
MB per second.
Generation 2. The informal name for the Ultrium 2
Tape Drive, which is the second-generation version of
the IBM Ultrium Internal Tape Drive (Generation 1). The
Generation 2 drive has a native storage capacity of up
to 200 GB per cartridge and a native sustained data
transfer rate of 35 MB per second.
gigabit (Gb). 1 000 000 000 bits. 1 Gb equals 100 MB.
gigabyte (GB). 1 000 000 000 bytes.
ground. An object that makes an electrical connection
with the earth.
H
hard addressing. Pertaining to the Fibre Channel
drive (Model T400F), a method that identifies the drive’s
LID and, consequently, its AL_PA (the AL_PA enables
the drive to communicate with other devices).
hardware. The physical equipment or devices that
form a computer.
head. See drive head.
Head Resistance Measurements test. Part of the
Test Head diagnostic, a procedure that determines
whether the tape drive’s head works correctly. The test
measures the head’s ability to withstand cracks and
other defects.
host. The controlling or highest-level system in a data
communication configuration. Synonymous with server.
hot-pluggable. Pertaining to the Ultrium 2 Tape Drive,
the ability to remove the drive from an enclosure while
the enclosure is powered-on.
hub. A communications device to which nodes on a
multi-point bus or loop are physically connected. Hubs
are commonly used in Fibre Channel networks to
improve the manageability of physical cables. They
maintain the logical loop topology of the network of
which they are a part, while creating a “hub and spoke”
physical star layout. Unlike switches, hubs do not
aggregate bandwidth. They typically support the addition
or removal of nodes from the bus while it is operating.
I
IBM TotalStorage LTO Ultrium 2 Tape Drive. A
data-storage device that controls the movement of the
magnetic tape in an IBM LTO Ultrium Tape Cartridge.
The drive houses the mechanism (drive head) that
reads and writes data to the tape. The drive is the first
of four drives planned for the Ultrium format. Its native
data capacity is 100 GB per cartridge; with 2:1
compression, its capacity is up to 200 GB.
ID. Identifier.
in. See inch.
inch. A unit of length equal to 1/36 yard or 25.4 mm.
initiator. In SCSI terms, a SCSI device that requests
an I/O process to be performed by another SCSI device
(a target). In many cases, an initiator can also be a
target.
108 IBM TotalStorage LTO Ultrium 2 Tape Drive