IBM TotalStorage SAN140M, Installation And Service Manual

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SAN140M Installation and Service Manual 348
A
active zone set
The zone set active for a multiswitch fabric, and created when a
user-specified zone set is enabled. See also
zone and zone set .
AL_PA See arbitrated loop physical address .
application (1) An information processing system, for example, a payroll
application, an airline reservation application, or a network
application. (2) Software used to perform specific types of
user-oriented work on a computer.
arbitrated loop One of three topologies offered by the Fibre Channel protocol. The
topology is structured as a loop and requires an attached port to
successfully arbitrate for access prior to establishing a circuit to
transmit or receive frames. See also
switched fabric and point-to-point .
arbitrated loop
physical address
A single-byte value used to identify physical port addresses on an
arbitrated loop. An arbitrated loop has one FL_Port address and 126
NL_Port addresses (127 valid AL_PAs).
arbitration
The process of selecting one respondent from a collection of several
candidates that request service concurrently.
Audit Log A log that summarizing actions (audit trail) performed on a managed
product through the director or switch-specific Element Manager
application or an SNMP workstation. Contrast with
EFC Audit Log .
B
bandwidth (1) The difference (expressed in Hertz) between the highest and
lowest frequencies in a range of frequencies. (2) The data transfer rate
of a network or electronic communication system.
BB_Credit See buffer-to-buffer credit .
beaconing The use of light-emitting diodes on ports, port cards, FRUs, directors,
and switches to aid in the fault-isolation process. When enabled,
beaconing causes amber LEDs to flash.
BER See bit error rate .