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 speci
fi
c path taken by an
individual frame from source to destination.
routing
The assignment of frames to speci
fi
c switch ports according to
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 state change noti
fi
cation. A switch function that
allows noti
fi
cation of fabric changes to be sent from the switch
to the speci
fi
ed 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 two N_ports.
service rate
The rate at which an entity can service requests.
single mode
The
fi
ber optic cabling 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
(such as UDP/IP) because it does not rely on the underlying
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.
84
Glossary
