NonStop S-Series System Expansion and Reduction Guide

Glossary
G-Series Common Glossary
Glossary-103
Subsystem Control Facility (SCF)
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 HP
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.
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), COBOL85, and HP Tandem Advanced
Command Language (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
.
superblock. The part of the Open System Services (OSS) environment that contains all the
information about the current state of the OSS file system. The superblock contains
such items as the free list and the size of inodes.
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.
super-group user. A user who can read, write, execute, and purge most files on the
system. Super-group users have user IDs that have 255 as the group number.
super ID. On HP NonStop™ systems, a privileged user who can read, write, execute, and
purge all files on the system. The super ID is usually a member of a system-supervisor
group.