IBM 201 manual LSFR0H see Low-smoke fire-retardant zero halogen, LS0H see Low-smoke zero halogen

nodes in the LGB to share the file serving load. A unique IP address and DNS host name combination identify each load-balancing group. Depending on the front-end connectivity, you can configure a node to be a member of more than one load-balancing group.

locally administered address. In a local area network, an adapter address that the user can assign to override the universally administered address. Contrast with universally administered address.

logical connection. In a network, devices that can communicate or work with one another because they share the same protocol.

logical drive. A unit of virtual storage that is made available to the network through VLUNs and iLUNs. It is made up of one or more physical disks that are combined using RAID 0, 1, 1E, 5, or 5E technology.

logical node. Logical nodes exist and operate in the physical context of the primary devices. There are different types of logical nodes and each is associated with a specific protocol stack.

loop. A closed unidirectional signal path connecting input/output devices to a system.

Low-smokefire-retardant zero halogen. Describes materials that are not flammable and do not emit large amounts of smoke or toxic gasses when burnt.

Low-smoke zero halogen. Describes materials that do not emit large amounts of smoke or toxic gasses when burnt.

LSFR0H (see Low-smoke fire-retardant zero halogen).

LS0H (see Low-smoke zero halogen).

M

macro. An instruction that causes the execution of a predefined sequence of instructions in the same source language.

main storage. Program-addressable storage from which instructions and other data can be loaded directly into registers for subsequent execution or processing (A) (I).

management information base (MIB). SNMP units of managed information that specifically describe an aspect of a system, such as the system name, hardware number, or communications configuration. A collection of related MIB objects is defined as a MIB.

megahertz (MHz). A unit of measure of frequency. One megahertz = 1 000 000 hertz.

MES (see miscellaneous equipment specification).

MIB. Management information base.

MIB browser. In the Simple Network Management Protocol (SNMP), a small PC or workstation application that can load MIB definitions, query or set data items in a managed node, and decode returned values and results in an easily readable form.

microinstruction. An instruction for operations at a level lower than machine instructions (T).

microprogram. A sequence of microinstructions. Microprograms are mainly used to implement machine instructions

(T).

migrate. To move to a changed operating environment, usually to a new release or version of a program, system, or device.

miscellaneous equipment specification (MES). Any equipment that is added after the time of the initial order.

mode field diameter. A measure of the width of the guided optical power’s intensity distribution in the core and the cladding of a single-mode fiber.

IBM Glossary of Storage Networking Terms 117