HSG80 Array Controller V8.7 Command Line Interface Reference Guide
Glossary–19
Glossary
peripheral device
Any unit, distinct from the CPU and physical memory, that can provide the system with input
or accept any output from it. Terminals, printers, tape drives, and disks are peripheral devices.
pluggable
A replacement method that allows the complete system to remain online during device
removal or insertion. The system bus must be halted, or quiesced, for a brief period of time
during the replacement procedure. See also hot-pluggable.
point-to-point connection
A network configuration in which a connection is established between two, and only two,
terminal installations. The connection might include switching facilities.
port
In general terms, the port is: (1) A logical channel in a communications system. (2) The
hardware and software used to connect a host controller to a communications bus, such as a
SCSI bus or serial bus.
Regarding the controller, the port is: (1) The logical route for data in and out of a controller
that can contain one or more channels, all of which contain the same type of data. (2) The
hardware and software that connects a controller to a SCSI device.
port_name
A 64-bit unique identifier assigned to each Fibre Channel port. The Port_Name is
communicated during the logon and port discovery process.
preferred address
The AL_PA which an NL_Port attempts to acquire first during initialization.
primary enclosure
The subsystem enclosure that contains the controllers, cache modules, external cache batteries,
and the PVA module.
private NL_Port
An NL_Port which does not attempt login with the fabric and only communicates with
NL_Ports on the same loop.
program card
The PCMCIA card containing the controller operating software. See also PCMCIA.
protocol
The conventions or rules for the format and timing of messages sent and received.