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HP Surestore FC 1Gb/2Gb Switch 16B Installation and Reference Guide Glossary-3
Disparity
The relationship of ones and zeros in an encoded character. “Neutral disparity”
means an equal number of each, “positive disparity” means a majority of ones,
and “negative disparity” means a majority of zeros.
Distributed
Fabrics
The combined user’s guides for the software products Extended Fabrics and
Remote Switch. “Distributed Fabrics” is not a software product. See also
Extended Fabrics, Remote Switch.
DLS
Dynamic Load Sharing; dynamic distribution of traffic over available paths.
Allows for recomputing of routes when an Fx_Port or E_Port changes status.
Domain ID
Unique identifier for the switch in a fabric. Usually automatically assigned by the
switch, but can also be assigned manually. Can be any value between 1 and 239.
E_D_TOV
Error Detect Time-out Value; the minimum amount of time a target waits for a
sequence to complete before initiating recovery. Can also be defined as the
maximum time allowed for a round-trip transmission before an error condition is
declared. See also R_A_TOV, RR_TOV.
E_Port
Expansion Port; a type of switch port that can be connected to an E_Port on
another switch to create an ISL. See also ISL.
EE_Credit
End-to-end Credit; the number of receive buffers allocated by a recipient port to
an originating port. Used by Class 1 and 2 services to manage the exchange of
frames across the fabric between source and destination. See also End-to-end
Flow Control, BB_Credit.
EIA Rack
A storage rack that meets the standards set by the Electronics Industry
Association.
Enabled Zone
Configuration
The currently enabled configuration of zones. Only one configuration can be
enabled at a time. See also Defined Configuration, Zone Configuration.
End-to-end
Flow Control
Governs flow of class 1 and 2 frames between N_Ports. See also EE_Credit.
Error
As applies to Fibre Channel, a missing or corrupted frame, time-out, loss of
synchronization, or loss of signal (link errors). See also Loop Failure.
Exchange
The highest level Fibre Channel mechanism used for communication between
N_Ports. Composed of one or more related sequences, and can work in either one
or both directions.
Extended
Fabrics
Software product that runs on Fabric OS and allows creation of a Fibre Channel
fabric interconnected over distances of up to 100 kilometers. See also Distributed
Fabrics.
F_Port
Fabric Port; a port that is able to transmit under fabric protocol and interface over
links. Can be used to connect an N_Port to a switch. See also FL_Port, Fx_Port.
Fabric
A Fibre Channel network containing two or more switches in addition to hosts
and devices. May also be referred to as a switched fabric. See also Topology, SAN,
Cascade.
Fabric Assist
A feature that enables private and public hosts to access public targets anywhere
on the fabric, provided they are in the same Fabric Assist zone. This feature is
available only when both QuickLoop and Zoning are installed on the switch.