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

Glossary
ServerNet Cluster 6780 Operations Guide—525606-002
Glossary-27
store and forward routing
store and forward routing. A form of message routing whereby a router must receive an
entire packet or message before it can start to forward the packet or message to the
next router. Contrast with wormhole routing.
switch group. See cluster switch group.
switch layer. See cluster switch layer.
switch layer number. See cluster switch layer.
switch logic board. See cluster switch logic board.
switch rack. See cluster switch rack.
switch zone. See cluster switch zone.
subnet. See subnetwork.
subnetwork. A physical network within an Internet protocol (IP) network. Each IP network
can be divided into a number of subnetworks. Within a given network, each
subnetwork is treated as a separate network. Outside the network, the subnetworks
appear as part of a single network. The terms subnetwork and subnet are used
interchangeably.
subsystem. (1) A secondary or subordinate system, usually capable of operating
independently of or asynchronously with a controlling system. (2) A program or set of
processes that manages a cohesive set of Subsystem Control Facility (SCF) objects.
Each subsystem has a manager through which applications can request services by
issuing commands defined by that subsystem. See also subsystem manager.
Subsystem Control Facility (SCF). An interactive interface for configuring, controlling, and
collecting information from a subsystem and its objects. SCF enables you to configure
and reconfigure devices, processes, and some system variables while your NonStop
S-series server is online.
Subsystem Control Point (SCP). The message router for Subsystem Control Facility
(SCF). There can be several instances of this process. Using the Subsystem
Programmatic Interface (SPI), applications send each command for a subsystem to an
instance of the SCP process, which in turn sends the command to the manager
process of the target subsystem. SCP also processes a few commands itself. It
provides security features, version compatibility, support for tracing, and support for
applications implemented as process pairs.
subsystem manager. A process that performs configuration and management functions for
a subsystem.
subvolume. A group of related files stored on a disk. All the files have the same volume
and subvolume name, but each file has a unique file identifier.