HP Surestore 64 Planning Guide - Page 154

M, Media Access Control address.

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link incident Interruption to link due to loss of light or other causes. load balancing Ability to evenly distribute traffic over multiple interswitch links within a fabric. Load balancing on directors takes place automatically. logical unit number Also known as LUN. In Fibre Channel addressing, a logical unit number is a number assigned to a storage device which, in combination with the storage device's node port's world-wide name, represents a unique identifier for a logical device on a storage area network. loopback plug In a fiber optic environment, a type of duplex connector used to wrap the optical output signal of a device directly to the optical input. loopback test Test that checks attachment or control unit circuitry, without checking the mechanism itself, by returning the output of the mechanism as input. LUN See logical unit number. M MAC address See Media Access Control address. maintenance port Connector on the director operator panel where a PC running an ASCII terminal emulator can be attached or dial-up connection made for specialized maintenance support. 140 Glossary

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140
Glossary
link incident
Interruption to link due to loss of light or other causes.
load balancing
Ability to evenly distribute traffic over multiple interswitch links within a fabric. Load
balancing on directors takes place automatically.
logical unit number
Also known as LUN. In Fibre Channel addressing, a logical unit number is a number
assigned to a storage device which, in combination with the storage device
’
s node port
’
s
world-wide name, represents a unique identifier for a logical device on a storage area
network.
loopback plug
In a fiber optic environment, a type of duplex connector used to wrap the optical output
signal of a device directly to the optical input.
loopback test
Test that checks attachment or control unit circuitry, without checking the mechanism
itself, by returning the output of the mechanism as input.
LUN
See
logical unit number.
M
MAC address
See
Media Access Control address.
maintenance port
Connector on the director operator panel where a PC running an ASCII terminal
emulator can be attached or dial-up connection made for specialized maintenance
support.