NonStop S-Series System Expansion and Reduction Guide

Glossary
G-Series Common Glossary
Glossary-31
Ethernet
Ethernet. A local area network (LAN) that uses the carrier sense multiple access with
collision detection (CSMA/CD) access method on a bus topology and is the basis for
the IEEE 802.3 standard.
Ethernet 4 ServerNet adapter (E4SA). A ServerNet adapter for Ethernet local area
networks (LANs) that contains four Ethernet ports.
Ethernet hub. A multiport repeater typically supporting 10Base-T cabling. Most hubs are
connectors for 8 or 12 cables. Also referred to as a concentrator.
Event Management Service (EMS). A Distributed Systems Management (DSM) product
that provides event collection, event logging, and event distribution facilities. EMS
provides different event descriptions for interactive and programmatic interfaces, lets
an operator or an application select specific event-message data, and allows for
flexible distribution of event messages within a system or network.
event message. Text intended for a system operator that describes a change in some
condition in the system or network, whether minor or serious. The change of condition
is called an event. Events can be operational errors, notifications of limits exceeded,
requests for actions needed, and so on. See also operator message
.
Event Viewer Server Manager. A persistent process that routes messages and data
between the OSM or TSM Event Viewer on the system console and event server and
summary server processes on the HP NonStop™ S-series server. An event server
process retrieves events. A summary server is a persistent process that maintains a
summary of all the events in a specified log file.
exception handler. A section of program code to which control is transferred when an
exception occurs. The exception handler then determines what action should be taken.
Expand line-handler process. A process pair that handles incoming and outgoing Expand
messages and packets. An Expand line-handler process handles direct links and also
binds to other processes using the Network Access Method (NAM) interface to support
Expand-over-X.25, Expand-over-FOX, Expand-over-ServerNet, Expand-over-TCP/IP,
and Expand-over-SNA links. See also Expand-over-ServerNet line-handler process
.
Expand network. The HP NonStop™ Kernel operating system network that extends the
concept of fault-tolerant operation to networks of geographically distributed HP
NonStop S-series systems. If the network is properly designed, communication paths
are constantly available even if a single line failure or component failure occurs.
Expand node. A system in an Expand network. See also node.
Expand node number. A number in the range 0 through 254, sometimes referred to as the
system number, that identifies a node in an Expand network. Each Expand node
number must be unique within the network. See also ServerNet node number
.
Expand-over-ServerNet line. The single line associated with an Expand-over-ServerNet
line-handler process. An Expand-over-ServerNet line has the same name and logical