Glossary
10 Gb
10 gigabit Ethernet computer networking standard, with a nominal data rate of 10 Gbps, 10
times as fast as gigabit ethernet.
arbitrated loop (AL)
Arbitrated loop, also known as FC-AL, is a Fibre Channel topology in which devices are
connected in a one-way loop fashion in a ring topology. Up to 127 devices may be attached in
the loop, but only two can communicate at the same time. Arbitrated loop is an alternative to
Fibre Channel switches.
array group
A set of drives in a storage system that have the same capacity and are treated as one RAID
unit. An array group contains user data and parity information, which ensures user data
integrity in the event of a disk drive failure in the array group.
bps
bits per second. The standard measure of data transmission speeds.
cache
A set of RAM (Random Access Memory) modules used to store data temporarily.
capacity
The amount of data storage space available on a physical storage device, generally measured
in bytes (MB, GB, TB, and so on).
CCI
See Command Control Interface.
challenge handshake authentication protocol (CHAP)
An authentication technique for conrming the identity of one computer to another.
Described in RFC 1994.
CHAP
See challenge handshak
e authentication pr
otocol.
CLI
command line interface
cluster
Multiple stor
age servers working together to r
espond to multiple read and write requests.
cluster capacity
The total amount of disk space in a cluster, excluding the space required for system overhead
and the operating system. Cluster capacity is the amount of space available for all archive
data, including original le data, metadata, and redundant data.
Glossary
Hitachi Virtual Storage Platform G1000, G1500, and VSP F1500 Hardware Guide 176
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