Asynchronous Terminals and Printer Processes Configuration and Management Manual

Glossary
Asynchronous Terminals and Printer Processes Configuration and Management Manual—424280-003
Glossary-9
outage minutes
an application being used is not available. See also planned outage and unplanned
outage.
outage minutes. A metric for measuring outages that translates percentages into minutes
of downtime 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).
Peripheral Utility Program (PUP). A utility used in D-series and earlier RVUs to manage
disks and other peripheral devices. In G-series and H-series RVUs, PUP functions are
performed by the Subsystem Control Facility (SCF).
persistence. For the Subsystem Control Facility (SCF), the capability of a generic process
to restart automatically if it was stopped abnormally. You configure this capability by
specifying a nonzero AUTORESTART value in an ADD command.
persistence count. The number of times the $ZPM persistence manager process will
restart a generic process that has been terminated abnormally. A generic process with
an AUTORESTART value of 10 (the maximum) is said to have a persistence count of
10. See also persistence.
persistence manager process. The $ZPM process that is started and managed by the
$ZCNF configuration utility process and that starts generic processes in G-series and
H-series RVUs and manages their persistence.
persistent configuration. A configuration that remains the same from one system load to
another.
planned outage. The time during which a NonStop system cannot work because of a
planned interruption. A planned outage can be time when the system or user
application is shut down to allow for servicing, upgrades, backup, or general
maintenance.
port. (1) A data channel that connects to other devices or computers. (2) A connector to
which a cable can be attached. The system transmits and receives data or requests
through ports on ServerNet adapters and processor multifunction (PMF) customer-
replaceable units (CRUs). A port is also called a connector. (3) The entrance or
physical access point (such as a connector) to a computer, multiplexer, device, or
network where signals are supplied, extracted, or observed.