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

XPath OS 7.4.x command reference guide 297
route As it applies to a fabric, the communication path between two switches. Might also apply to
the specific path taken by an individual frame, from source to destination. See also FSPF.
routing The assignment of frames to specific switch ports, according to frame destination.
RR_TOV Resource recovery timeout value. The minimum time a target device in a loop waits after an LIP
before logging out an SCSI initiator. See also E_D_TOV, R_A_TOV.
RSCN Registered state change notification. A switch function that allows notification of fabric
changes to be sent from the switch to specified nodes. The fabric controller issues RSCN
requests to N_Ports and NL_Ports, but only if they have registered to be notified of state
changes in other N_Ports and NL_Ports. This registration is performed through the State
Change Registration (SCR) Extended Link Service. An N_Port or NL_Port can issue an RSCN to
the fabric controller without having completed SCR with the fabric controller.
RTWR Reliable transport with response. Might appear as a task in portLogDump command output.
running disparity A binary parameter indicating the cumulative disparity (positive or negative) of all previously
issued transmission characters.
RW Read/write. Refers to access rights.
RX Receiving frames.
RX_ID Responder exchange identifier. A 2-byte field in the frame header that can be used by the
responder of the exchange to identify frames as being part of a particular exchange.
S_ID Source ID. Refers to the native port address (24-bit address).
SAN Storage area network. A network of systems and storage devices that communicate using Fibre
Channel protocols. See also fabric.
SAN architecture The overall design of a storage network solution, which includes one or more related fabrics,
each of which has a topology.
SAN port count The number of ports available for connection by nodes in the entire SAN.
scalability One of the properties of a SAN: the size to which a SAN topology can grow port and switch
counts with ease.
SCN State change notification. Used for internal state change notifications, not external changes.
This is the switch logging that the port is online or is an Fx_Port, not what is sent from the
switch to the Nx_Ports.
SCR State change registration. Extended Link Service (ELS) requests the fabric controller to add the
N_Port or NL_Port to the list of N_Ports and NL_Ports registered to receive the Registered State
Change Notification (RSCN) Extended Link Service.
SCSI Small Computer Systems Interface. A parallel bus architecture and a protocol for transmitting
large data blocks to a distance of 15 to 25 meters.
SCSI-2 An updated version of the SCSI bus architecture.
SCSI-3 An SCSI standard that defines transmission of SCSI protocol data over different kinds of links.
SDRAM The main memory for a switch.
sectelnet A protocol similar to Telnet but with encrypted passwords for increased security.
security policy Rules that determine how security is implemented in a fabric. Security policies can be
customized through Secure Fabric OS or Fabric Manager.
SEQ_ID Sequence identifier. A 1-byte field in the frame header change to identify the frames as being
part of a particular exchange sequence between a pair of ports.
sequence A group of related frames transmitted in the same direction between two N_Ports.
sequence initiator The N_Port that begins a new sequence and transmits frames to another N_Port.
sequence recipient Serializing/deserializing circuitry. A circuit that converts a serial bit stream into parallel
characters, and vice versa.
serial The transmission of data bits in sequential order over a single line.
server A computer that processes end-user applications or requests.
service rate The rate at which an entity can service requests. See also request rate.