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read/write head
NL_Port
A port attached to a node for use in the point-to-point arbitrated loop and fabric
topologies of Fibre Channel. The NL_Port is configured as a private or a public loop.
node
A device that contains a minimum of one N_Port, one NL_Port, or both.
offline
Neither controlled by, nor communicating with, a computer. (IBM)
online
Pertaining to the operation of a functional unit when under the direct control of the
computer. (T)
operator control panel
A functional unit that contains switches used to control all or part of a computer and
possibly the indicators giving information about its functioning. (T)
performance
One of two major factors on which the total productivity of a system depends.
Performance is largely determined by a combination of throughput, response time,
and availability. (IBM)
point-to-point
A topology in which exactly two ports communicate. In Fibre Channel, the two ports
are N_Ports.
port
A specific communications end point within a host. A port is identified by a port
number. (IBM) (2) In Fibre Channel, an access point in a device where a link attaches.
private loop
A Fibre Channel arbitrated loop with no fabric attachment.
Private NL_Port
An NL_Port that does not attempt a Fabric Login.
protocol
A set of semantic and syntactic rules that determines the behavior of functional units
in achieving communication. (I)
public loop
A Fibre Channel arbitrated loop with an attachment to a fabric.
Public NL_Port
An NL_Port that attempts a Fabric Login.
R/W
Read or write
read/write head
The data sensing and recording unit of a tape drive. (IBM)
Glossary-9
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