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O
operating system (OS). A collection of system
programs that control the overall operation of a
computer system.
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 frame
delimiters, primitive signals, and primitive sequences.
Ordered sets are used to differentiate Fibre Channel
control information from data frames and to manage the
transport of frames. See also frame delimiter, primitive
signal, and primitive sequence.
OS. See operating system.
P
packet. A set of information transmitted across a
network. See also frame.
participating mode. A mode in which a loop port
(L_port) in a loop has a valid arbitrated loop physical
address (AL_PA) and can arbitrate, send frames, and
retransmit received transmissions. See also
nonparticipating mode.
path selection. The selection of a transmission path
through the fabric. Switches use the Fibre Channel
shortest path first (FSPF) protocol.
PCI. Peripheral control interconnect.
PDU. Power distribution unit.
Performance Monitoring. A feature that provides
error and performance information to the administrator
and user for use in storage management.
phantom address. An arbitrated loop physical
address (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 cage. The metal casing extending out of the
optical port on the switch, and in which the gigabit
52
IBM TotalStorage SAN Switch: 2109 Model M12 and Model M14 User's Guide
interface converter (GBIC) or small form-factor
pluggable (SFP) can be inserted.
port card. A Fibre Channel card that contains optical
or copper port interfaces, and acts like a switch module.
See also 16-port card.
port login (PLOGI). The port-to-port login process by
which initiators establish sessions with targets. See also
fabric login.
port module. A collection of ports in a switch.
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.
primary FCS switch. Primary fabric configuration
server switch. The switch that actively manages the
configuration and security parameters for all switches in
the fabric. See also backup FCS switch and FCS
switch.
primitive sequence. A part of an ordered set that
indicates or initiates port states. See also ordered set.
primitive signal. A part of an ordered set that
indicates events. See also ordered set.
principal switch. The switch that assumes the
responsibility to assign domain IDs. The role of principal
switch is negotiated after a "build fabric" event.
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 fabric loop port (FL_port).
private loop direct attach (PLDA). A subset of fibre
channel standards for the operation of peripheral
devices.
private NL_port. A node loop port (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 fabric loop port (FL_port), and can contain
both public and private node loop ports (NL_ports).
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