5190/5194 Modular Tape Subsystem Manual

Glossary
5190/5194 Modular Tape Subsystem Manual—426878-002
Glossary-3
compression
local or remote access to the system for service and maintenance. The TSM package
performs the same role as that of Compaq Tandem Maintenance and Diagnostic
System (TMDS), Syshealth, and Remote Maintenance Interface (RMI) on K-series
servers.
compression. See Improved Data Recording Capability (IDRC).
Configuration Utility Program (COUP). A utility used on D-series and earlier releases to
make online changes to the configuration of devices and controllers. COUP is part of
the Dynamic System Configuration (DSC) facility. On G-series releases, similar
functions are performed by the Subsystem Control Facility (SCF).
controller. See I/O controller and ServerNet addressable controller (SAC).
COUP. See Configuration Utility Program (COUP).
CRU. See customer-replaceable unit (CRU).
customer-replaceable unit (CRU). A unit that can be replaced in the field either by
customers or by qualified personnel trained by Compaq. CRUs are divided into the
categories of Class 1, Class 2, and Class 3 according to the risk of causing a system
outage if the documented replacement procedure is not followed correctly and how
much CRU-replacement training or experience is advisable.
daisy-chaining. Connecting two units serially to a controller or adapter.
DEFINE. A Compaq Tandem Advanced Command Language (TACL) command you can
use to specify a named set of attributes and values to pass to a process.
density. The number of bits or characters that can be recorded in a given length of tape,
expressed in bits/inch (bpi). The 5190 and 5194 tape drives read and write at a
density of 38,000 bpi.
device ID. A number that identifies the drive address to which a Compaq NonStop
Himalaya system can send data or from which the system can receive data. The 5190
and 5194 tape drives use a device ID of 5 (the default device ID) unless two drives are
attached by means of daisy chaining, in which case the device IDs are 4 and 5. On
NonStop Himalaya K-series servers, the device ID of a tape drive must match the unit
number specified for the drive by the Configuration Utility Program (COUP) or in the
CONFTEXT configuration file.
Distributed Systems Management/Software Configuration Manager (DSM/SCM). A
graphical user interface (GUI)-based program that installs new software and creates a
new Compaq NonStop Kernel operating system. DSM/SCM creates a new software
revision and activates the new software on the target system.
drive CRU. See tape drive CRU.