ServerNet Cluster 6780 Operations Guide (G06.24+, H06.03+)

Glossary
ServerNet Cluster 6780 Operations Guide—525606-002
Glossary-18
online
online. Used to describe tasks that can be performed while the NonStop Kernel operating
system and system utilities are operational. Contrast with offline.
operator message. A message, intended for an operator, that describes a significant event
on a NonStop S-series system. An operator message is the displayed-text form of an
Event Management Service (EMS) event message. See also event message.
OSM Event Viewer. A component of the OSM software. The OSM Event Viewer lets you
set up criteria to view Event Management Service (EMS) log files in several ways,
enabling you to rapidly assess service problems.
OSM Low-Level Link. A connection between the software running on a system console
and the master service processors (MSPs) on a NonStop S-series server. When the
NonStop Kernel operating system is not running, communication must take place over
the OSM Low-Level Link. You can also communicate with a NonStop S-series server
over an OSM Low-Level Link when the operating system is running. See also OSM
Service Connection.
OSM Service Connection. A component of the OSM software package. The OSM Service
Connection enables you to communicate with a NonStop S-series server when the
NonStop Kernel operating system is running. When the operating system is not
running, communication must take place using the OSM Low-Level Link.
packet. A block of information that contains fields for addressing, sequencing of information,
possible priority indicators, and a portion of a message or an entire message. See also
ServerNet packet.
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).
peer fabric. The fabric on which an operation is not taking place. The X and Y fabrics are
peers. If an action is being performed on one fabric, the other fabric is the peer fabric.
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
RVUs and manages their persistence.