Overland Storage SnapSAN S1000 User Manual page 117

SnapSAN S1000 User Guide
back-end application may interact directly with the front-end or, perhaps more typically, is a
program called from an intermediate program that mediates front-end and back-end
activities.
Back-off Percent
In order to allow drives from a different family or manufacturer to be used as a replacement
for a drive in an array, it is recommended that a small percentage of the drive's capacity be
reserved when creating the array. This is user selectable, from 0 to 10 percent. This is
sometimes known as Reserved Capacity.
Bridging
Devices that connect and pass packets between two network segments that use different
communications protocol.
Bus or Channel
A common physical path composed of wires or other media, across which signals are sent
from one part of a computer to another. A channel is a means of transferring data between
modules and adapters, or between an adapter and SCSI devices. A channel topology network
consists of a single cable trunk that connects one workstation to the next in a daisy-chain
configuration. All nodes share the same medium, and only one node can broadcast messages
at a time.
CA
Short for Certificate Authority. A trusted third-party in a network that issues and manages
security credentials.
Cache Flush Array
This is the array that is used to automatically flush cache data in a situation where power
has failed to some of the drives.
Cat 5 Cable
Short for Category 5, it is network cabling that consists of four twisted pairs of copper wire
terminated by 8P8C modular connectors. CAT 5 cabling supports frequencies up to 100 MHz
and speeds up to 100 Mbps. (CAT 5e cabling supports frequencies up to 1000 MHz and
speeds up to 1000 Mbps.) It can be used for ATM, token ring, 1000BASE-T, 100BASE-T, and
10BASE-T networking.
Cat 5 is based on the EIA/TIA 568 Commercial Building Telecommunications Wiring
Standard developed by the Electronics Industries Association as requested by the Computer
Communications Industry Association in 1985.
Cat 6 Cable
Short for Category 6, it is network cabling that consists of four twisted pairs of copper wire
terminated by 8P8C modular connectors made to higher standards that help reduce noise
caused by crosstalk and system noise. The ANSI/TIA-568-B.2-1 specification states the cable
may be made with 22 to 24 AWG gauge wire, so long as the cable meets the specified testing
standards.
It is designed for Gigabit Ethernet that is backward compatible with the Category 5/5e and
Category 3 cable standards. Cat 6 features more stringent specifications for crosstalk and
system noise. The cable standard provides performance of up to 250 MHz and is suitable for
10BASE-T / 100BASE-TX and 1000BASE-T (Gigabit Ethernet).
10400310-003 01/2013
©2010-13 Overland Storage, Inc.
Glossary
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