User guide

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Glossary–1
Hitachi Unified Storage VM Block Module Hardware User Guide
Glossary
This glossary defines the special terms used in this document.
A
array
See disk array.
B
back-end I/O module
The hardware component that controls the transfer of data between the
drives and cache. A back-end I/O module feature consists of a pair of
boards.
C
controller chassis
The hardware assembly that contains the logic and processing
components of the HUS VM storage system, including the front-end
directors, virtual storage directors, cache memory, switches, and back-
end directors. The HUS VM storage system can be configured with one
or two control chassis.
D
disk array
Disk array, or just array, is a complete storage system, including the
control and logic devices, drives, connecting cables, and racks.