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Glossary
operator message. The text displayed for a system operator that describes an event.
operations outage class. An outage class that includes errors caused by operations personnel
due to accidents, inexperience, or malice. See
OSS. See
Open System Services
outage. Time during which the system is not capable of doing useful work because of a
planned or unplanned interruption. From the end-user's perspective, an outage is any
time the application is not available.
outage class. A concept developed by Compaq to categorize the cause of unplanned and
planned outages. There are five outage classes: physical, design, operations,
environmental, and reconfiguration.
outage log. A record of system outages. An outage log can provide an accurate assessment of
availability. Compaq recommends that outages be measured in minutes rather than
percentages.
outage minutes. A metric recommended by Compaq for measuring outages. Translates
percentages into minutes of down time per year.
output destination. The resource to which Subsystem Control Facility (SCF) sends its
responses to commands. SCF can direct output to a disk file, an application process, a
terminal, or a printer. The initial output destination is determined by the form of the
RUN command used to initiate SCF. The output destination can be changed
dynamically during an SCF session.
path. The route between a processor and a subsystem. If a subsystem is configured for fault
tolerance, it has a primary path (from the primary processor) and a backup path (from
the backup processor).
PATHCOM. The interactive administrative interface to the NonStop™ Transaction
Services/MP core service.
PATHMON process. The central control process for the NonStop™ TS/MP transaction-
processing core service and the optional Pathway/TS software, which together form the
Pathway environment. The PATHMON process controls all processes and devices in the
Pathway environment and provides the means to configure, manage, monitor, and
change the configuration of the Pathway environment.
Pathway environment. The programs and operating environment required for developing
and running online transaction-processing (OLTP) applications. This group of tools is
packaged as two separate products: NonStop™ TS/MP and the optional Pathway/TS
software.
Pathway Open Environment Toolkit (POET). A set of programs and utilities that assist in
the creation and running of client/server applications for NonStop™ Kernel systems.
(OSS).
Guardian User's Guide —425266-001
Glossary -10
outage class.
operator message.
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