Specifications

GL–16 Glossary
parity RAID See RAIDset.
partition A logical division of a container, represented to the host as a logical unit.
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.
point-to-point
connection
A network configuration in which a connection is established between two, and
only two, terminal installations. The connection may include switching facilities.
port (1) In general terms, 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 cabinet The primary cabinet is 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.
public NL_Port An NL_Port that attempts login with the fabric and can observe the rules of either
public or private loop behavior. A public NL_Port may communicate with both
private and public NL_Ports.
program card The PCMCIA card containing the controller’s operating software.