NonStop S-Series Planning and Configuration Guide (G06.25+)

Glossary
HP NonStop S-Series Planning and Configuration Guide—523303-015
Glossary-90
selectable segment
one unit into virtual memory as the file is loaded. See also code segment and data
segment.
selectable segment. A type of logical segment formerly known as an extended data
segment. The data area for a selectable segment always begins with relative segment
4, and this area can be dynamically switched among several selectable segments by
calls to the Guardian SEGMENT_USE_ procedure. The effect is similar to a rapid
overlaying of one large data area. See also logical segment
and flat segment.
SEM. See ServerNet extender module (SEM).
semaphore. A mechanism used to provide multiple processes with access to a shared data
object.
semi-globalized. An import control characteristic of a loadfile that allows the loadfile first to
obtain symbols from its own definitions and then to obtain others as for a globalized
loadfile. See also searchList
.
sensitive command. A Subsystem Control Facility (SCF) command that can be issued only
by a user with super-group access, by the owner of the subsystem, or by a member of
the group of the owner of the subsystem. The owner of a subsystem is the user who
started that subsystem (or any user whose application ID is the same as the server
ID—the result of a PROGID option that requires super-group access). Contrast with
nonsensitive command
.
separately derived power source. A facility wiring system where power is derived from a
generator, transformer, or converter windings and there is no direct electrical
connection, including a solidly connected grounded circuit conductor (neutral), to
supply conductors originating in other facility wiring systems. Types of separately
derived power sources include standby power generator
, uninterruptible power supply
(UPS), isolation transformer, and computer-room power center (CRPC).
serial communications controller (SCC). A type of communications controller. Each
quad-integrated communications controller (QUICC) has four SCCs to handle the two
Ethernet ports and the two wide area network (WAN) ports.
serial copper. A standard for physical connectivity in ServerNet I and ServerNet II networks
that is available both in HP NonStop™ S-series servers and in Windows NT clusters.
Serial copper uses serial encoding and supports 50 and 125 megabyte/second (MB/s)
speeds. The maximum link distance at 125 MB/s is 25 meters.
serial copper PIC. See serial copper plug-in card (PIC).
serial copper plug-in card (PIC). A plug-in card (PIC) for the modular ServerNet expansion
board (MSEB) and I/O multifunction (IOMF) 2 customer-replaceable unit (CRU) that
supports the serial copper interface. See also serial copper
and plug-in card (PIC).
serial maintenance bus (SMB). A bus that connects service processors (SPs) within an
enclosure to each other and to the customer-replaceable units (CRUs) in the group.