potentials caused by direct contact or induced by
an electrostatic field. Potentially harmful to
electronic components.
Ethernet
A local area network (LAN) architecture using a
bus or star topology and supporting data transfer
rates of 10, 100, and 1000 Mbps. It is one of the
most widely implemented LAN standards. The
802.11 protocols are often referred to as
“wireless Ethernet.”
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 NST5100X expansion units
that connects via SAS to a Nexsan NST5100
storage unit’s Controller Node.
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 s, failover
describes one Controller Node taking over the
host connections and storage pool control of the
other Controller Node when that controller fails.
FASTier™
Nexsan’s proprietary cache system that uses
SSD or NVDIMM technology to increase random
I/O performance of SATA and SAS disk drives.
FCC
The Federal Communications Commission; the
federal agency that regulates electromagnetic
emissions.
Fibre 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, Fibre
Channel signaling can run on both twisted-pair
copper wire and fiber-optic cables.
Fibre Channel port
Any entity that actively communicates over a
Fibre Channel network. Usually implemented in
a device such as disk storage or a Fibre Channel
switch. Depending on the system, the Fibre
Channel ports on Nexsan storage units can
support 2Gb/s, 4Gb/s, or 8Gb/s connections.
Fibre Channel switch
A network switch compatible with the Fibre
Channel protocol. Allows the creation of a Fibre
Channel network, which is currently the core
component of most storage area networks
(SANs).
Fibre Channel target
A storage system end-point on the that uses
Fibre Channel connectivity. Each storage pool
can have one or multiple Fibre Channel targets.
Fibre Channel targets can be seen by all ports on
the .
Firmware
Software stored in read-only memory (ROM) or
programmable ROM (PROM), therefore
becoming a permanent part of a computing
device.
Full replication
In asynchronous replication, full replication refers
to a replication operation that sends all the data
on the primary to the remote . Only the initial
replication, when you first set up asynchronous
data replication between two systems, is a full
replication. All successive replications are
incremental.
G
Gateway
An internetworking system that joins together the
different subnets of a network or two networks
that use different base protocols. A network
gateway can be implemented completely in
Glossary
Nexsan Unity Hardware Reference Guide
www.nexsan.com
8
