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Nx_port. A node port that can operate as either an
N_port or NL_port. See also node port, node loop port.
OFC. Open fibre control.
ordered set. A transmission word that uses 8B/10B
mapping and begins with the K28.5 character. Ordered
sets occur outside of frames, and include the following
items:
v Frame delimiters mark frame boundaries and
describe frame contents.
v Primitive signals indicate events.
v Primitive sequences indicate or initiate port states.
Ordered sets are used to differentiate fibre-channel
control information from data frames and to manage the
transport of frames.
packet. A set of information transmitted across a
network. See also frame.
participating mode. A mode in which an L_port in a
loop has a valid AL_PA and can arbitrate, send frames,
and retransmit received transmissions. See also
non-participating mode.
path selection. The selection of a transmission path
through the fabric. Switches use the FSPF protocol.
PCB. Printed circuit board.
PCI. Peripheral control interconnect.
Performance Monitoring. A product that provides
error and performance information to the administrator
and end user for use in storage management.
PCV. Page code valid.
PF. Page format.
phantom address. An AL_PA value that is assigned to
a device that is not physically in the loop. Also known
as phantom AL_PA.
phantom device. A device that is not physically in an
arbitrated loop but is logically included through the use
of a phantom address.
PLDA. See private loop direct attach.
PLOGI. See port login.
PMC. PCI mezzanine card.
P/N. Part number.
point-to-point. A fibre-channel topology that employs
direct links between each pair of communicating
entities. See also topology.
port login (PLOGI). The port-to-port login process by
which initiators establish sessions with targets. See also
fabric login.
port_name. The unique identifier assigned to a
fibre-channel port. Communicated during login and port
discovery.
POST. See power-on self-test.
power-on self-test (POST). A series of diagnostics
that are automatically run by a device when the power
is turned on.
private device. A device that supports arbitrated loop
protocol and can interpret 8-bit addresses, but cannot
log into the fabric.
private loop. An arbitrated loop that does not include
a participating FL_port.
private loop direct attach (PLDA). A subset of fibre
channel standards for the operation of peripheral
devices.
private NL_port. An NL_port that communicates only
with other private NL_ports in the same loop and does
not log into the fabric.
protocol. A defined method and a set of standards for
communication.
public device. A device that supports arbitrated loop
protocol, can interpret 8-bit addresses, and can log into
the fabric.
public loop. An arbitrated loop that includes a
participating FL_port, and may contain both public and
private NL_ports.
public NL_port. An NL_port that logs into the fabric,
can function within either a public or a private loop, and
can communicate with either private or public NL_ports.
QuickLoop. (1) A product that makes it possible to
allow private devices within loops to communicate with
public and private devices across the fabric through the
creation of a larger loop. (2) The arbitrated loop created
using this software. A QuickLoop can contain a number
of devices or looplets; all devices in the same
QuickLoop share a single AL_PA space.
RAID. See redundant array of independent disks.
RAM. See random access memory.
RAN. Remote Asynchronous Notification.
random access memory (RAM). A temporary storage
location in which the CPU stores and executes its
processes.
R_A_TOV. See resource allocation timeout value.
redundant array of independent disks (RAID). A
collection of disk drives that appear as a single volume
to the server and are fault tolerant through mirroring or
parity checking. See also just a bunch of disks.
51
Glossary
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