ServerNet Cluster 6780 Operations Guide (G06.28+, H06.05+)

Glossary
ServerNet Cluster 6780 Operations Guide—525606-003
Glossary-14
listener
listener. The process or server that is notified by the message system that a message from
some other process or server is being delivered.
load. (1) To transfer the NonStop Kernel operating system image or a program from disk
into a computer’s memory so that the operating system or program can run. (2) To
insert a tape into a tape drive, which prepares it for a tape operation (read or write).
local area network (LAN). A network that is located in a small geographical area and
whose communications technology provides a high-bandwidth, low-cost medium to
which low-cost nodes can be connected. One or more LANs can be connected to the
system such that the LAN users can access the system as if their workstations were
connected directly to it. Contrast with wide area network (WAN).
local node. See local system.
local processor. A processor in the same node as the ServerNet cluster monitor process
(SNETMON) that is reporting status about the processor.
local system. From the perspective of a particular SNETMON, the system or node on
which that SNETMON is running. From the perspective of an OSM operator, the
system to which the operator is logged on. One of the characteristics of a local system
is that it does not have active external ServerNet paths to itself. See also remote node.
logic board. See cluster switch logic board.
logical device name. The name assigned to an I/O process during its configuration. Other
processes use the logical device name when issuing OPEN, READ, WRITEREAD, and
CLOSE Guardian procedure calls to the I/O process.
logical device number. A number that identifies a particular I/O device in the system.
Logical device numbers are assigned to physical I/O devices.
logical interface (LIF). A process that allows an application or another process to
communicate with data communications hardware.
master service processor (MSP). A service processor (SP) that provides the basic service
processor functions as well as centralized system functions such as a console port, a
modem port for remote support functions, and system-load control. The enclosure
containing processors 0 and 1 (group 01) contains a pair of MSPs.
MB. See megabyte (MB).
Measure. A tool used for monitoring the performance of NonStop S-series systems.
Measure can be used to check the performance of a ServerNet cluster.
megabyte (MB). A unit of measurement equal to 1,048,576 bytes (1024 kilobytes). See also
gigabyte (GB), kilobyte (KB), and terabyte (TB).