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.