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Glossary
Subsystem Control Point (SCP). The management process for all NonStop™ Kernel data
communications subsystems. There can be several instances of this process.
Applications using the Subsystem Programmatic Interface (SPI) send all commands for
data communications subsystems to an instance of this process, which in turn sends the
commands on to the manager processes of the target subsystems. SCP also processes a
few commands itself. It provides security features, version compatibility, support for
tracing, and support for applications implemented as NonStop™ process pairs.
subvolume. A group of related files stored on a single disk volume; all the files have the
same volume and subvolume name, but each file has a unique file identifier.
subvolume defaulting. The practice of making the system provide the subvolume identifier
in a file name by providing only the volume name followed by the file identifier. A
D-series file-system interface interprets volume-name.file-ID as
volume-name.subvolume-name with the file-ID missing.
super-group user (255, n). A user ID that allows users to execute some potentially
destructive commands. The super-group user is provided for operators who perform
system operations tasks, such as controlling the status of peripherals and other system
components.
super ID (255,255). A user ID that allows users to do anything on the system. Users with the
super ID can access all data and devices.
support area. The area where the operations staff is located.
SWAN. See
ServerNet Wide Area Network (SWAN)
swap space. Each processor has at least one kernel-managed swap file that provides the swap
space needed by its processes. Proper configuration and management of kernel-managed
swap space is critical to the operation of your system.
system. A node. All the processors, controllers, firmware, peripheral devices, software, and
related components that are directly connected together to form an entity that is
managed by one operating system image and operated as one computer.
system area network (SAN). A high-speed network, within a system, that connects
processors to each other and to peripheral controllers. A SAN has the performance of a
massively parallel interconnect, but has distribution capabilities similar to a local area
network (LAN). NonStop™ Himalaya S-series servers support the ServerNet system
area network (ServerNet SAN).
TACL. See
Tandem Advanced Command Language (TACL).
Tandem Advanced Command Language (TACL). A powerful, extended command
interpreter for the Guardian environment that enables users to perform work on
NonStop™ Kernel systems, such as defining aliases, macros, and function keys. TACL
also functions as a programming language.
Guardian User's Guide —425266-001
Glossary -16
Subsystem Control Point (SCP).
concentrator.
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