HP StorageWorks XPath OS 7.4.X Command Reference Guide (AA-RVHCC-TE, September 2005)

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public key
cryptography
A type of cryptography that uses a key pair, with the two keys in the pair called at different
points in the algorithm. The sender uses the recipient’s public key to encrypt the message, and
the recipient uses the recipient’s private key to decrypt it. See also key pair, PKI.
public loop An arbitrated loop that includes a participating FL_Port and can contain both public and
private NL_Ports.
public NL_Port An NL_Port that logs in to the fabric, can function within either a public or a private loop, and
can communicate with either private or public NL_Ports.
QLA A type of Fibre Channel controller.
QLFA QuickLoop Fabric Assist. Arbitrated-loop technology.
QoS Quality of service.
quad A group of four adjacent ports that share a common pool of frame buffers.
queue A mechanism for each AL_PA address that allows for collecting frames prior to sending them
to the loop.
QuickLoop A software product that allows multiple ports on a switch to create a logical loop. Devices
connected through QuickLoop appear to each other as if they are on the same arbitrated
loop.
QuickLoop Mode Allows initiator devices to communicate with private or public devices that are not in the same
loop.
R_A_TOV Resource allocation timeout value. The maximum time a frame can be delayed in the fabric
and still be delivered. See also E_D_TOV, RR_TOV.
R_CTL Route control. The first 8 bits of the header, which defines the type of frame and its contents.
R_RDY Receiver ready. A primitive signal indicating that the port is ready to receive a frame.
R_T_TOV Receiver transmitter timeout value, used by receiver logic to detect loss of synchronization
between transmitters and receivers.
radius The greatest distance between any edge switch and the center of a fabric. A low-radius
network is better than a high-radius network.
RAID Redundant array of independent disks. 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
JBOD.
RAIT Redundant array of independent tapes.
RCS Reliable Commit Service. Refers to ILS command code.
RCS_SFC RCS Stage Fabric Config. Refers to ILS command code.
receiver A device that performs detection and signal processing.
redundancy Having multiple occurrences of a component to maintain high availability (HA).
remote switch An optional product for long-distance fabrics, requiring a Fibre Channel-to-ATM or SONET
gateway.
repeater A circuit that uses a recovered clock to regenerate and transmit an outbound signal.
request rate The rate at which requests arrive at a servicing entity.
resilience A fabric’s ability to adapt to or tolerate a failure of a component within the fabric.
resilient core/edge
topology
Two or more switches acting as a core to interconnect multiple edge switches. Nodes attach to
the edge switches.
responder The N_Port with which an exchange originator wants to communicate.
retimer A circuit that uses an independent clock to generate outbound signals.
return loss The ratio (expressed in dB) of incident power to reflected power, when a component or
assembly is introduced into a link or system. Return loss can also refer to optical power or to
electrical power in a specified frequency range.
RLS Read Link Status.