TCP/IPv6 Migration Guide

Glossary
HP NonStop TCP/IPv6 Migration Guide—524524-004
Glossary-7
Ethernet 4 ServerNet adapter (E4SA)
Ethernet 4 ServerNet adapter (E4SA). A ServerNet adapter for Ethernet local area
networks (LANs) that contains four Ethernet ports.
event. In DSM terms, a significant change in some condition in the system or network.
Events can be operational errors, notifications of limits exceeded, requests for action
needed, and so on.
event log. A file or set of files maintained by EMS to store event messages generated by
subsystems.
Event Management Service (EMS). A part of DSM used to provide event collection, event
logging, and event distribution facilities. It provides for different event descriptions for
interactive and programmatic interfaces, lets an operator or application select specific
event-message data, and allows for the flexible distribution of event messages within a
system or network. EMS has an SPI-based programmatic interface for both reporting
and retrieving events. See also DSM or event message.
event management. The reporting and logging of events, the distribution and retrieval of
information concerning those events, and the actions taken by operations personnel or
software in response to the events. Compare control and inquiry.
event message. A special kind of SPI message that describes an event occurring in the
system or network. Compare command message.
Expand. The Expand subsystem enables you to link together as many as 255
geographically dispersed HP systems to create a network with the same reliability,
capacity to preserve data integrity, and potential expansion as a single HP system.
extensible structure. In DSM programmatic interfaces, a structure declared for the value of
an extensible structured token. See also extensible structured token. Compare fixed
structure.
extensible structured token. In DSM programmatic interfaces, a token consisting of a
token code and a value that is an extensible structure. Extensible structures can be
extended by adding new fields at the end in later RVUs. Such structures are typically
used to indicate the attributes of an object being operated on and to return status and
statistics information in responses; they can also be used for other purposes. The
token is referenced by a token map that describes the structure to SPI so that SPI can
provide compatibility between different versions of the structure. Compare simple
token.
fabric. A simplified way of representing a complex set of interconnections through which
there can be multiple and (to the user) unknown paths from point to point. The term
fabric is used to refer to the X or Y portion of the ServerNet system area network
(ServerNet SAN), for example the X fabric.
failover. A feature that you can enable in your NonStop TCP/IPv6 environment that
provides continuous access to the network during a LIF failure.