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Glossary
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.
MAC address
See media access control address.
maintenance port
Connector on the director where a PC running an ASCII terminal emulator can be attached or
dial-up connection made for specialized maintenance support.
managed product
Hardware product that can be managed with the HAFM. For example, the edge 2/32 is a
managed product. See also device.
management information base
Related set of software objects (variables) containing information about a managed device and
accessed via SNMP from a network management station.
management session
Management session exists when a user logs onto the HAFM server. HAFM can support
multiple concurrent management sessions. The user must specify the network address of the
server at logon time.
Media Access Control address
Hardware address of a node (device) connected to a network.
MIB
See management information base.
multicast
Delivery of a single transmission to multiple destination N_Ports. Can be one to many or many
to many. All members of the group are identified by one IP address.
edge switch 2/32 installation guide
Glossary–11
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