R
R_A_TOV
Resource allocation time-out value. The maximum time a frame can be delayed in the fabric and still
be delivered.
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
The rate at which requests arrive at a servicing entity.
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 specific switch ports according to frame destination.
RSCN
Registered state change notification. A switch function that allows notification of fabric changes to be
sent from the switch to the specified nodes.
S
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
on
page 46.
sequence
A group of related frames transmitted in the same direction between two N_ports.
service rate
The rate at which an entity can service requests.
SFP
Small Form-Factor Pluggable
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 (such as UDP/IP) because it does not rely on the underlying
communication protocols.
See also
on page 43,
on page 46.
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
.
Glossary
45
