HP StorageWorks 2/16V Brocade Glossary (53-1000040-03, November 2006) - Page 31

Glossary 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. RBAC Role-Based Access Control. RCS Reliable Commit Service. Refers to Brocade-specific ILS command code. RCS_SFC RCS Stage Fabric Config. Refers to Brocade-specific 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 A Brocade optionally licensed 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 The ability of a fabric to adapt to or tolerate a failure of a component within the fabric. resilient core/ Two or more switches acting as a core to interconnect multiple edge switches. SAN devices attach to the edge topology edge switches. responder The N_Port with which an exchange originator attempts 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. Can refer to optical power or to electrical power in a specified frequency range. RLS Read Link Status. root zone database The zone database from a pre-Fabric OS v5.2.0 fabric. Once Fabric OS v5.2.0 is installed, the root zone database is owned by AD0. In Fabric OS v5.2.0 and above, each AD has its own zone database (with both defined and effective zone sets and all related zone objects). See also AD0. route In a fabric, the communication path between two switches. Can also apply to the specific path taken by an individual frame, from source to destination. See also FSPF. routed fabric Two or more edge fabrics interconnected by one or more backbone fabrics. Brocade Glossary 27 Publication Number: 53-1000040-03