Tandem Failure Data System (TFDS) Manual

Glossary
HP Tandem Failure Data System (TFDS) Manual—540122-003
Glossary-11
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™ server is online.
subsystem manager. A process that performs configuration and management functions for
a subsystem.
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.
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.
The super ID has the set of special permissions called appropriate privileges. In the
Guardian environment, the structured view of the super ID, which is (255, 255), is most
commonly used. In the Open System Services (OSS) environment, the scalar view of
the super ID, which is 65535, is most commonly used.
superuser. See super ID.
SYSnn subvolume. A subvolume on the $SYSTEM volume where the new version of the
HP NonStop™ operating system image is located. Also located on the SYSnn
subvolume is system-dependent and release version update (RVU)-dependent
software. nn is an octal number in the range %00 through %77.
system load. (1) To start the system; to load the HP NonStop™ operating system image
into the memory of a processor. See RELOAD. (2) The process of loading the
operating system. A system load changes a system from an inactive to an active (or
operational) state by loading software that establishes communication between the
operating system and configured system peripherals.
system-managed process. Another name for a generic process.
TFDS. See HP Tandem Failure Data System (TFDS).
TMR. Triple-Modular Redundancy. Having three active NSBEs per logical processor. Also
called triplex.