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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.
request rate Therateatwhichrequestsarriveataservicingentity.
route With respect to a fabric, the communication path between two
switches. May also apply to the specific path taken by an
individual frame from source to destination.
routing The assignment of frames to specificswitchportsaccordingto
frame destination.
RR_TOV Resource recovery time-out value. The minimum time a target
device in a loop waits after a LIP before logging out a SCSI
initiator.
RSCN Registered sta te change notification. A switch function that
allows notificationoffabricchangestobesentfromtheswitch
to the specified nodes.
SAN Storage area network. A network of systems and storage
devices that communicate using FC protocols.
SDRAM Synchronous dynamic random access memory. The main
memory for a switch. See also switch.
sequence A group of related frames transmitted in the same direction
between t wo N_por ts.
service rate The rate at which an entity can service re quests.
single mode The fiber optic cab ling standard that corresponds to distances
up to 10 km between devices.
SNMP Simple Network Management Protocol. An Internet
management protocol that uses either IP for network-level
functions and UDP for transport functions, or TCP/IP for
both. SNMP can be made available over other protocols
(suchasUDP/IP)becauseitdoesnotrelyontheunderlying
communication protocols. See also MIB, trap (SNMP).
SNS Simple Name Server. A switch service that stores names,
addresses, and attributes for up to 15 minutes, and provides
them as required to other devices in the fabric. May also be
referred to as a directory service.
switch Hardware that routes frames according to FC protocol and is
controlled by software.
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Glossary