SCF Reference Manual for G-Series RVUs (G06.24+)

SCF Reference Manual for G-Series RVUs—520413-004
3-1
3 Introduction to SCF
The Subsystem Control Facility (SCF) is used to configure, control, and collect
information about subsystems and objects. This section gives an overview of SCF
features and operation and of the objects on which it operates. It also gives the
general format of SCF commands.
Subsystem Control Facility Architecture
SCF provides an operator interface to an intermediate process called the Subsystem
Control Point (SCP). SCP in turn provides an interface to the various subsystems
performing system operations and services. This structure is illustrated in Figure 3-1.
The default SCP process, known to the system as $ZNET, is a generic process that
provides access for application programs, whether local or remote, to monitor and
control a subsystem. If $ZNET is not running, SCF starts its own SCP process (which
is removed from the system when SCF is stopped).
Topic Page
Subsystem Control Facility Architecture
3-1
Subsystem Control Point (SCP) 3-2
SCF Function Overview 3-3
How SCF Works 3-4
SCF Objects 3-5
SCF Subdevices 3-5
General SCF Command Format 3-6
SCF Object States 3-7
Figure 3-1. SCF and SCP Overview
SCF
SCP
($ZNET)
VST011.vsd
$ZZKRN
$ZZWAN
Other
Subsystem
Managers
SCF
Command
File
Application
Process