HP Mainframe Connectivity Design Guide

MAN Metropolitan area network. A communications network that covers a geographic area such as
a town, city, or suburb.
McDATA FICON directors manufactured for HP by McDATA Corporation.
MCP Mode Conditioning Patch.
MFL A 4-G FICON channel card with long wave SFPs.
MFS A 4-G FICON channel card with short wave SFPs.
MIDAW Modified indirect data address word. An alternative to using CCW data chaining in channel
programs.
MIF Multiple Image Facility. A mainframe feature that allows multiple LPARs to share FICON channel
paths.
MUL An 8-G FICON channel card with long wave SFPs.
MUS An 8-G FICON channel card with short wave SFPs.
mux Multiplexer.
MVS Multiple virtual storage.
N
NSPOF No single point of failure. A configuration in which failure of a single component does not cause
failure of the entire system.
O
OADM Optical add/drop multiplexer. A wavelength-specific network device that enables ring or
point-to-point topologies.
OSPF Open Shortest Path First. A Fibre Channel routing protocol.
out-of-band
communication
Communication through a different communications channel than that used by operational data.
oversubscription When transmissions from one or more devices exceed the capacity of an ISL or port.
P
Parallel Sysplex A method of connecting mainframes in a data center to share I/O devices, data, and a Sysplex
timer.
See also Sysplex.
PAV Parallel access volume. A feature that allows the assignment of multiple alias addresses to a disk
volume, allowing I/O from a single LPAR to access the same data simultaneously.
See also MA.
PCHID Physical channel ID.
PDCM Port dynamic connectivity matrix. The matrix used by mainframe administrators to allow or prohibit
connectivity between ports on the FICON director.
PDU Power distribution unit.
platform A combination of supported hardware components and an operating system on a server from a
specific vendor.
port address A value that identifies the physical port on the FICON director to which the CU or CHPID is
attached.
PPRC Peer-to-peer remote copy.
PR/SM Processor Resource/Systems Manager, pronounced prism. An internal process that allows sharing
of mainframe resources.
Q
QoS Quality of service. A traffic management feature.
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