written to an encrypted array.
End User License Agreement
A type of license used for most software. It is a
legal contract between the manufacturer/author
and the end user of an application. It details how
the software can and cannot be used and any
restrictions that the manufacturer/author
imposes. The user has the option of not
accepting the End User License Agreement, in
which case the user surrenders the rights and
ability to use the software. End User License
Agreements also protect both parties from
liability if the software is used in a way not
intended by the manufacturer/author.
Ethernet
A system for connecting a number of computer
systems to form a local area network (LAN), with
protocols to control the passing of information
and to avoid simultaneous transmission by two
or more systems. Supports data transfer rates of
10, 100, 1,000, and 10,000 megabits per second
(Mb/s). 10, 100, and 1,000Mb/s networks are
often referred to as 10BASE-T, 100BASE-T, and
1000BASE-T, respectively. 10,000Mb/s
networks are usually referred to as 10Gb
Ethernet or 10GbE.
Ethernet address
See “MAC address”.
EULA
See “End User License Agreement”.
event log
A record of system events that tracks
informational, warning, and error events, such as
when significant milestones are reached or when
errors occur during activity.
Expansion Controller
A module of Nexsan High-Density Storage
expansion units that connects via SAS to a
Nexsan storage unit’s RAID controller.
F
failover
The capability of a system to switch over
automatically to a redundant or standby system
upon the failure or abnormal termination of the
previously active system. In Nexsan storage
systems, failover describes one RAID controller
taking over the host connections and RAID set
control of the other RAID Controller when that
controller fails.
fault-tolerant
Systems that can continue operating when one
or more parts fail are said to be “fault-tolerant”. In
Nexsan storage systems, the term can be
applied to two different areas: the individual
arrays and the unit as a whole. Arrays are said to
be fault-tolerant when data is preserved even if
one or more disks fail. The unit as a whole is said
to be fault-tolerant if the system mode is set to 2-
Port Active-Active (2PAA) mode, 4-Port Active-
Active (4PAA) mode, or All Ports All LUNs
(APAL) mode and volumes are properly mapped.
FC port
See “Fiber Channel port”.
FCC
The Federal Communications Commission; the
United States federal agency that regulates
electromagnetic emissions.
Fiber Channel
A gigabit (Gb) speed network technology
primarily used for storage networking and the
current standard connection type for storage area
networks (SANs). Despite its name, Fiber
Channel signaling can run on both twisted-pair
copper wire and fiber-optic cables.
Fiber Channel port
Any entity that actively communicates over a
Fiber Channel network. Usually implemented in
a device such as disk storage or a Fiber Channel
switch. Depending on the system, the Fiber
Channel ports on Nexsan storage units can
support 2Gb/s, 4Gb/s, or 8Gb/s connections.
Glossary
Nexsan High-Density Storage
User Guide
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