NonStop S-Series Server Description Manual (G06.24+)

Glossary
HP NonStop S-Series Server Description Manual—520331-003
Glossary-38
foreground process group
foreground process group. In the Open System Services (OSS) environment, a process
group whose members have privileges for access to their controlling terminal that are
denied to processes in background process groups of that terminal. Each session with
a controlling terminal has only one foreground process group for that terminal.
Contrast with background process group.
foreground process group ID. In the Open System Services (OSS) environment, the
process group ID of a foreground process group.
four-lane link. The four single-mode fiber-optic (SMF) ServerNet cables that connect the
two HP NonStop™ Cluster Switches on the same external fabric (for example, X1 and
X2) in a split-star topology.
FOX. See Fiber Optic Extension (FOX).
FOXMON. See FOX monitor process.
FOX monitor process. The Fiber Optic Extension (FOX) monitor process for the
ServerNet/FX adapter subsystem. The process name is $ZZFOX.
FOX ring. The fiber-optic cabling that connects the nodes in a Fiber Optic Extension (FOX)
cluster. This term is also used to refer to the topology of a FOX network.
FPGA. See field-programmable gate array (FPGA).
F-PIC. See fiber-optic plug-in card (F-PIC).
frame. (1) An assembly of sheet-metal parts that is an integral part of an enclosure and
might contain peripherals or a chassis, depending on the type of enclosure. The frame
enables the enclosures to be stacked and has provisions for routing and securing
cables. The frame of an enclosure has dimensions that conform to an industry-
standard 19-inch rack. (2) A unit of transmission in some data communications
protocols, usually containing header, data, and checksum fields. (3) In NonStop S-
series processors, a 4096-byte unit of physical memory; also called a physical page.
frame base. An assembly consisting of casters, leveling pads, and frame sheet metal that is
an integral part of a base enclosure.
free list. In the Open System Services (OSS) file system, the list of available inodes that
can be allocated to files.
frequency. The number of complete cycles/second of sinusoidal variation. For alternating-
current (AC) power lines, the most common frequencies are 60 hertz and 50 hertz.
FRU. See field-replaceable unit (FRU).
FRU information record (FIR). A collection of information that every field-replaceable unit
(FRU) carries with it, such as part number, revision, track ID, and media access control
(MAC) address.