User`s guide

376 Implementing an Open IBM SAN
Loop Circuit A temporary point-to-point like path
that allows bi-directional communications
between loop-capable ports.
Loop Topology An interconnection structure in
which each point has physical links to two
neighbors resulting in a closed circuit. In a loop
topology, the available bandwidth is shared.
LVD Low Voltage Differential
Management Agent A process that exchanges a
managed node's information with a management
station.
Managed Node A managed node is a computer,
a storage system, a gateway, a media device
such as a switch or hub, a control instrument, a
software product such as an operating system or
an accounting package, or a machine on a
factory floor, such as a robot.
Managed Object A variable of a managed node.
This variable contains one piece of information
about the node. Each node can have several
objects.
Management Station A host system that runs
the management software.
Mb/s Megabits per second. Also sometimes
referred to as Mbps. In computing terms it is
approximately 1,000,000 bits per second. Most
precisely it is 1,048,576 (1024 x 1024) bits per
second.
MB/s Megabytes per second. Also sometimes
referred to as MBps. In computing terms it is
approximately 1,000,000 bytes per second. Most
precisely it is 1,048,576 (1024 x 1024) bits per
second.
Meter 39.37 inches, or just slightly larger than a
yard (36 inches)
Media Plural of medium. The physical
environment through which transmission signals
pass. Common media include copper and fiber
optic cable.
Media Access Rules (MAR).
MIA Media Interface Adapter - MIAs enable
optic-based adapters to interface to
copper-based devices, including adapters, hubs,
and switches.
MIB Management Information Block - A formal
description of a set of network objects that can be
managed using the Simple Network Management
Protocol (SNMP). The format of the MIB is
defined as part of SNMP and is a hierarchical
structure of information relevant to a specific
device, defined in object oriented terminology as
a collection of objects, relations, and operations
among objects.
Mirroring Theprocessofwritingdatatotwo
separate physical devices simultaneously.
MM Multi-Mode - See Multi-Mode Fiber
MMF See Multi-Mode Fiber - - In optical fiber
technology, an optical fiber that is designed to
carry multiple light rays or modes concurrently,
each at a slightly different reflection angle within
the optical core. Multi-Mode fiber transmission is
used for relatively short distances because the
modes tend to disperse over longer distances.
See also: Single-Mode Fiber, SMF
Multicast Sending a copy of the same
transmission from a single source device to
multiple destination devices on a fabric. This
includes sending to all N_Ports on a fabric
(broadcast) or to only a subset of the N_Ports on
a fabric (multicast).
Multi-Mode Fiber (MMF) In optical fiber
technology, an optical fiber that is designed to
carry multiple light rays or modes concurrently,
each at a slightly different reflection angle within
the optical core. Multi-Mode fiber transmission is
used for relatively short distances because the
modes tend to disperse over longer distances.
See also: Single-Mode Fiber
Multiplex The ability to intersperse data from
multiple sources and destinations onto a single
transmission medium. Refers to delivering a
single transmission to multiple destination Node
Ports (N_Ports).
N_Port Node Port - A Fibre Channel-defined
hardware entity at the end of a link which
provides the mechanisms necessary to transport
information units to or from another node.