HP StorageWorks 2/64 HP StorageWorks Fabric OS 5.x Master Glossary (AA-RW7NA-T - Page 26

resilient core/ edge topology responder retimer return loss RLS route routing R_RDY RR_TOV RSCN R_T_TOV RTWR running disparity RW RX RX_ID SAN SAN architecture SAN port count SCA Two or more switches acting as a core to interconnect multiple edge switches. Nodes attach to the edge switches. See also edge switch. The N_Port with which an exchange originator attempts to communicate. A circuit that uses an independent clock to generate outbound signals. The ratio expressed in decibels ) of incident power to reflected power, when a component or assembly is introduced into a link or system. Can refer to optical power or to electrical power in a specified frequency range. Read Link Status. As it applies to a fabric, the communication path between two switches. It might also apply to the specific path taken by an individual frame, from source to destination. See also FSPF. The assignment of frames to specific switch ports, according to frame destination. Receiver ready. A primitive signal indicating that the port is ready to receive a frame. Resource recovery timeout value. The minimum time a target device in a loop waits after an LIP before logging out a SCSI initiator. See also E_D_TOV and R_A_TOV. 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 that occur in other N_Ports and NL_Ports. This registration is performed via 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. Receiver transmitter timeout value. Used by receiver logic to detect loss of synchronization between transmitters and receivers. Reliable transport with response. Might appear as a task in portLogDump command output. A binary parameter indicating the cumulative disparity (positive or negative) of all previously issued transmission characters. Read/write. A term that refers to access rights. An abbreviation for communications term receive. See also TX. 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. Storage area network. A network of systems and storage devices that communicate using Fibre Channel protocols. See also fabric. The overall design of a storage network solution, which includes one or more related fabrics, each of which has a topology. The number of ports available for connection by nodes in the entire SAN. Single connector attachment. A type of disk drive connector that is frequently used for attaching SCSI drives to host systems. 26 Glossary