NonStop System Glossary

substate
Further information about the state of a device. The state and substate together provide information
about the current condition of a device or path to a device.
SUBSYS object type
The Subsystem Control Facility (SCF) object type for most subsystems that use SCF as the user
interface.
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 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.
Subsystem Programmatic Interface (SPI)
A set of procedures and associated definition files and a standard message protocol used to define
common message-based interfaces for communication between management applications and
subsystems. It includes procedures to build and decode specially formatted messages; definition
files in Transaction Application Language (TAL), COBOL, and TACL for inclusion in programs,
macros, and routines using the interface procedures; and definition files in Data Definition Language
(DDL) for programmers writing their own subsystems.
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.
summary report
A brief informational listing of status or configuration information provided by the Subsystem Control
Facility (SCF) STATUS or INFO command. Contrast with detailed report.
super group
The group of user IDs that have 255 as the group number. This group has special privileges; many
HP utilities have commands or functions that can be executed only by a member of the super group.
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