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Glossary 145
Glossary
ANSI American National Standards Institute, which sets standards for, amongst
other things, SCSI and the safety of electrical devices.
autoload When a tape cartridge is inserted, a tape drive with autoload will
automatically load it without the host having to send a load command. If a
drive does not have autoload, the drive will take no action until it receives a
load command.
compression A procedure in which data is transformed by the removal of redundant
information in order to reduce the number of bits required to represent the
data. This is basically done by representing strings of bytes with codewords.
ECMA European Computer Manufacturers Association. The European equivalent of
ANSI.
host The host computer system acting as controller for the drive.
load The process in which the drive takes in an inserted cartridge and goes online.
LUN Logical Unit Number, by which different devices at a particular SCSI ID can
be addressed individually. The drive has a fixed LUN of 0.
LVD Low-Voltage Differential. See SCSI.
offline The drive is offline if the tape is currently unloaded or not in the drive. The
host has limited access, and cannot perform any commands that would cause
tape motion. The host can, however, load a tape, if one is inserted, and can
execute any diagnostic tests that do not require tape motion.
online The drive is online when a tape is loaded. The host has access to all command
operations, including those that access the tape, set configurations and run
diagnostic tests.
SAN Storage Area Network. A dedicated, high-speed network that establishes a
direct connection between storage elements and servers. The hardware that
connects workstations and servers to storage devices in a SAN is referred to
glossary