HP NonStop G-Series - Manual (Page 280)

backup processor A processor running the HP NonStop™ operating system that communicates with the primary
processor , allowing the processors to remain independent. A component failure in one processor
has no effect on any other processor.
blower A variable speed airflow device that pulls air into an enclosure or element. It usually pulls air in
from the front and exhausts the heated air out the rear.
board A frame on which computer circuitry is mounted. Same as logic board .
boot A synonym for load .
bus A system or subsystem data path that provides serial or parallel interconnection for multiple
modules or components. Examples of buses are the serial maintenance buses (SMBs) and the
small computer system interface (SCSI) buses.
C
cabinet The rack, front and back doors, side panels (if any), and PDUs. Cabinets contain enclosures
and other system components. A cabinet that can contain multiple enclosures is also called a
modular cabinet .
client A software process, hardware device, or combination of the two that requests services from a
server. Often, the client is a process that resides on a programmable
system console and is
the part of an application that provides the user interface. The system console client might also
perform other portions of the application logic.
cluster A collection of servers or nodes that can function either independently or collectively as a
processing unit. See also
ServerNet cluster .
cluster switch
enclosure An enclosure provided by HP for housing the subcomponents of an HP NonStop™ Cluster
Switch. The subcomponents include the ServerNet II Switch, the AC transfer switch, and the
uninterruptible power supply (UPS). A cluster switch enclosure resembles, but is half the height
of, a standard HP NonStop S-series system enclosure.
cluster switch
layer number A number in the range 1 through 4 that identifies the position of a cluster switch within a cluster
switch group. See also
cluster switch group .
cluster switch logic
board A circuit board that provides switching logic for HP NonStop™ ServerNet Switch (model 6780) .
The logic board (LB) has a front panel for operator and maintenance functions.
cluster number A number that uniquely identifies a cluster . For example, this number can range from 1 through
14 for nodes in a Fiber Optic Extension (FOX) ring.
cluster switch See HP NonStop Cluster Switch (model 6770) and HP NonStop ServerNet Switch (model 6780) .
cluster switch
group Within an external ServerNet fabric, all the cluster switches that belong to the same cluster
switch zone . A cluster switch group can consist of up to four 6780 switches, each representing
one cluster switch layer . All of the cluster switches that form a cluster switch group typically are
installed in the same cluster switch rack.
cluster switch
layer The topological cluster switch position within a cluster switch group . Each cluster switch group
can contain up to four layers, numbered 1 to 4 from bottom to top. A cluster switch layer consists
of a pair of cluster switches (X and Y) and provides connections for up to eight ServerNet nodes.
Layers within a group are interconnected by intragroup cables. When all four layers are present,
the intragroup cables are configured as a
vertical tetrahedron . See also cluster switch layer
number .
cluster switch
zone A pair of X-fabric and Y-fabric cluster switch groups and the ServerNet nodes connected to
them. Up to three zones are possible. The zones, if more than one, are interconnected by
interzone cables, with each
cluster switch layer cabled separately from the other layers
cold load A synonym for system load or load (in the case of a single processor load).
Common
Communication A ServerNet adapter that provides a NonStop S-series integration platform for Signaling System
Number 7 (SS7) protocol communications.
ServerNet adapter
(CCSA)
communications
line interface
processor (CLIP) The major programmable device within the ServerNet wide area network (SWAN) concentrator,
providing link-level protocol and a software interface to the host. The CLIP stores and implements
specific communications protocols.
280 Glossary