5190/5194 Modular Tape Subsystem Manual

Glossary
5190/5194 Modular Tape Subsystem Manual—426878-002
Glossary-6
logic board (LB)
logic board (LB). A printed wiring assembly (PWA) on which computer circuits (chips and
wiring) are mounted. Examples of logic boards are the processor and memory board
(PMB) on Compaq NonStop Himalaya S-series servers and the 3216 tape controller
logic board on Compaq NonStop Himalaya K-series servers).
MB. See megabyte (MB).
megabyte (MB). A unit of measurement equal to 1,048,576 bytes (1024 kilobytes). See
also kilobyte (KB)
.
memory dump. A copy of the memory of a processor. The dump can be to tape or disk.
message panel. A series of eight light-emitting diodes (LEDs) on the front panel of a 5190
or 5194 tape drive or automatic cartridge loader (ACL). The message panel displays
alphanumeric characters or symbols that combine to form status messages.
modular storage system. A framework for stacking multiple Compaq storage devices.
The modular storage system consists of low-cost, common-form-factor modules that
can be vertically stacked in an external support structure. Devices can include
cartridge tape, streaming tape, and disk modules. A maximum of two modules (for
instance, six cartridge tape drives) can be stacked in one support structure that makes
up a modular storage system.
modular tape subsystem. A subsystem that contains a tape drive customer-replaceable
unit (CRU) packaged in a stackable module of a modular storage system and a
controller or adapter that communicates with a Compaq NonStop Himalaya system.
module. (1) A single storage compartment or position in a modular storage system. The
tape drive module can house two tape drive customer-replaceable units (CRUs). (2) A
set of components sharing a common interconnection, such as a backplane. A module
is a subset of a group, and it is usually contained in an enclosure. In a Compaq
NonStop Himalaya S-series server, a group contains exactly one module.
mount. To place a cartridge tape in the automatic cartridge loader (ACL) cartridge
magazine of a 5190 or 5194 tape drive. Once cartridge tapes are mounted in the
cartridge magazine and the cartridge magazine is placed in the ACL, the autoloader
can load the cartridge tapes from the cartridge magazine into the tape drive.
NOT READY state. The offline state of a 5190 or 5194 tape drive. NT RDYU and NT
RDYF are the two NOT READY states.
offline. The state of a tape drive in which the drive cannot execute read or write
commands from the host computer system. Contrast with online
.
online. The state of a tape drive in which the drive can execute read or write commands
from the host computer system. Contrast with offline
.
online dump. To copy specified database tables and files onto disk or tape for later use. If
a database is damaged, online dumps allow the file recovery process to restore the