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IBM TotalStorage DS300 and DS400 Best Practices Guide
LUN assignment criteria
The combination of a
set of LUN types, a minimum size, and a maximum
size used for selecting a LUN for automatic
assignment.
LUN masking
This allows or blocks access to the
storage devices on the SAN. Intelligent disk
subsystems like the IBM Enterprise Storage Server
provide this kind of masking.
M
MAN
See Metropolitan Area Network.
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.
Managed resource
A physical element to be
managed.
Management Agent
A process that exchanges a
managed node's information with a management
station.
Management Information Base
A logical
database residing in the managed system which
defines a set of MIB objects. A MIB is considered a
logical database because actual data is not stored in
it, but rather provides a view of the data that can be
accessed on a managed system.
Management Station
A host system that runs the
management software.
MDM
See Multiple Device Manager.
MDS
See Metadata Server Engine.
Metadata Server Engine
Within SAN File System,
an MDS is the physical hardware on which a
Metadata server and an Administrative server run.
Metropolitan Area Network
A network that
connects nodes distributed over a metropolitan
(city-wide) area as opposed to a local area (campus)
or wide area (national or global).
MIB
See Management Information Base.
MIB object
A MIB object is a unit of managed
information that specifically describes an aspect of a
system. Examples are CPU utilization, software
name, hardware type, and so on. A collection of
related MIB objects is defined as a MIB.
Mirroring
The process of writing data to two
separate physical devices simultaneously
Multiple Device Manager
The Multiple Device
Manager is software that has been designed to allow
administrators to manage Storage Area Networks
(SANs) and storage from a single console.
N
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.
NAS
See Network attached storage.
Network attached storage (NAS)
Network
Attached Storage - a term used to describe a
technology where an integrated storage system is
attached to a messaging network that uses common
communications protocols, such as TCP/IP. An NAS
device is attached to a TCP/IP- based network (LAN
or WAN), and accessed using CIFS and NFS -
specialized I/O protocols for file access and file
sharing.
Network topology
A physical arrangement of
nodes and interconnecting communications links in
networks based on application requirements and
geographical distribution of users.
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