Performance Monitoring. A feature that provides
error and performance information to the administrator
and end 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.
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 and communicated during login and
port discovery.
POST. See power-on self-test.
power-on self-test (POST). A series of internal
diagnostic tests that are activated each time the system
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. A Fibre Channel Arbitrated Loop (FC-AL)
with no fabric attachment.
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 set of rules controlling the communication
and transfer of data between two or more devices or
systems in a communications network.
public device. A device that supports arbitrated loop
protocol, can interpret 8-bit addresses, and can log into
the fabric.
public loop. A Fibre Channel Arbitrated Loop (FC-AL)
with an attachment to a fabric.
public NL_port. A node loop port (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 feature 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 arbitrated loop physical
address (AL_PA) space.
RAID. See redundant array of independent disks.
RAM. See random access memory.
random access memory (RAM). A temporary storage
location in which the central processing unit (CPU)
stores and executes its processes.
R_A_TOV. See resource allocation timeout value.
read-only memory (ROM). Memory in which stored
data cannot be changed by the user except under
special conditions.
reduced instruction set computer (RISC). A
computer that uses a small, simplified set of frequently
used instructions for rapid processing.
Redundant Array of Independent Disks (RAID). A
collection of two or more disk drives that present the
image of a single disk drive to the system. In the event
of a single device failure, the data can be read or
regenerated from the other disk drives in the array.
registered state change notification (RSCN). A
switch function that allows notification of fabric changes
to be sent from the switch to specified nodes.
remote procedure call (RPC). A facility that a client
uses to request the execution of a procedure call from a
server.
Remote Switch. A feature that runs on the Fabric
operating system (OS) and enables two fabric switches
to be connected over an asynchronous transfer mode
(ATM) connection. Remote Switch requires a compatible
Fibre Channel-to-ATM gateway. The distance between
each switch and the respective ATM gateway can be up
to 10 km (6.214 mi).
request rate. The rate at which requests arrive at a
servicing entity. See also service rate.
resource allocation timeout value (R_A_TOV). A
value used to time out operations that depend on the
maximum possible time that a frame can be delayed in
a fabric and still be delivered. This value is adjustable in
one microsecond increments from 10 - 120 seconds.
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