NBT Manual

Glossary
NBT Manual—424773-001
Glossary-19
Subsystem Control Point (SCP)
Subsystem Control Point (SCP). .n DSM, the management process for all Compaq data
communications subsystems. There can be several instances of this process.
Applications using SPI send all commands for data communications subsystems to an
instance of this process, which in turn sends the commands on to the manager processes
of the target subsystems. SCP also processes a few commands itself. It provides security
features, version compatibility, support for tracing, and support for applications
implemented as NonStop process pairs. See also management process
or manager
process.
Subsystem ID (SSID). In DSM programmatic interfaces, a data structure that uniquely
identifies a subsystem to SPI. It consists of the name of the owner of the subsystem
(such as Compaq), a subsystem number that identifies that particular subsystem, and a
subsystem version number. The subsystem ID is an argument to most of the SPI
procedures.
Subsystem Programmatic Interface (SPI). In DSM, a set of procedures and associated
definition files used to define common message-based programmatic interfaces for
communication between requesters and servers—for instance, in a management
application. SPI includes procedures to build and decode specially formatted messages;
definition files in Pascal, TAL, C, COBOL85, and TACL for inclusion in programs,
macros, and routines using the SPI procedures; and definition files in DDL for
programmers writing their own subsystems.
summary state. In DSM interfaces to Compaq data communications subsystems, one of the
generally defined possible conditions of an object, with respect to the management of
that object. A summary state differs from a state in two ways. First, a summary state
pertains to the management of an object, whereas a state may convey other kinds of
information about the object. Second, summary states are defined the same way for all
Compaq data communications subsystems, whereas the set of possible states differs
from subsystem to subsystem. The management programming interfaces to Compaq
data communications subsystems refer to summary states rather than to states. Examples
of summary states are STARTED, STOPPED, SUSPENDED, and ABORTING.
SWAN concentrator. See ServerNet wide area network (SWAN) concentrator
.
symbolic name. In DSM programmatic interfaces, a name used in programs to refer to
commonly used values, token codes, token maps, extensible structures, and other related
variables for use in management programs.
SYSGEN. The Compaq system generation program, used to configure objects such as
devices, controllers, and I/O processes in a newly installed system, or to update the
system when new software is released. Objects to be configured are defined to SYSGEN
in a special configuration file, which can then be cold loaded onto the system. The
Compaq OSI products are not configured with SYSGEN, but the underlying X25AM
and TLAM I/O processes are.