Availability Guide for Problem Management

Problem Management Tools
Availability Guide for Problem Management–125509
9-32
Subsystem Control Facility (SCF)
Subsystem Control Facility (SCF)
The Subsystem Control Facility is used to configure, control, and collect information
about Tandem subsystems.
You use the Subsystem Control Facility (SCF) on G-series systems to configure, control,
and display information about configured objects within SCF subsystems. Each SCF
subsystem responds to and processes SCF commands that affect that subsystem. If you
are a super-group user (255,n), you can use the SCF command-line user interface to
make configuration changes from any connected terminal.
When you install a G-series release on a Himalaya S-series server, the $SYSTEM disk
and a few other initial system-load processes are preconfigured, and SYSGENR uses the
CONFTEXT file to establish some system attributes for all processors. Then you finish
the system configuration by using SCF.
Using SCF commands, you can:
•
Add, alter, or delete objects (such as devices, I/O processes, and generic processes)
•
Obtain configured or current information about objects
•
Alter some system variables configured on D-series systems by SYSGEN
How SCF Works
Some SCF commands operate on the objects (devices, subdevices, processes, and so
forth) belonging to each subsystem. The ADD and DELETE commands add objects to
and delete objects from the list of objects in the SCF sphere of control. After an object is
configured by SCF, you can use the START, STOP, and ABORT commands to change
the state of the object, or you can use the ALTER command to change the values of
selected attributes of the object. You can also use the INFO command to display the
currently configured attribute values for objects and the STATUS command to display
the current dynamic status of objects.
The TRACE command traces the operation of an object. While being traced, the object
continues normal operation, but it passes all message traffic to a trace procedure. When
the trace procedure recognizes a message that meets its selection criteria, it stores the
message in a trace file. You can then use PTrace program commands to examine the file.
Some subsystems use all, or portions of, the SCF trace functions; other subsystems
provide their own trace functions. Refer to the manual for your particular subsystem for
information about how your subsystem implements the TRACE command.
The ENV command displays the current settings of the SCF command parameters that
establish the program environment.
Several commands are available for displaying and changing SCF session parameters.
For example, the SYSTEM and VOLUME commands control the default system,
volume, and subvolume names used for expanding file names. The OBEY and OUT
commands control the files used for command input and display output. The ASSUME
command defines a default object to be used when the object is omitted from an SCF
command.