director product manager user guide
Glossary–13
Glossary
logical unit number (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 application. For example, the
Director 2/64 is a managed product. See also device.
management information base (MIB)
Related set of software objects (variables) containing information about a managed device and
accessed via SNMP from a network management station.
Management Services application
Software application that provides back-end product-independent services to the HAFM
application. Management Services runs only on the HAFM server, and cannot be downloaded
to remote workstations.
management session
A management session exists when a user logs on to the HAFM application. The application
can support multiple concurrent management sessions. The user must specify the network
address of the HAFM server at logon time.
