User guide

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Hitachi Unified Storage VM Block Module Hardware User Guide
Glossary–2
drive box
The hardware component of the HUS VM that houses disk drives and/or
flash drives.
dynamic provisioning
An approach to managing storage. Instead of “reserving” a fixed amount
of storage, it removes capacity from the available pool when data is
actually written to disk. Also called thin provisioning.
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flash drive
A data drive that uses a solid-state memory device instead of a rotating
hard disk drive to store information.
free capacity
The amount of storage space (in bytes) that is available for use by the
host systems.
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host I/O module
The hardware component that processes channel commands from hosts
and manages host access to cache. A host I/O module is also referred
to as a channel adapter (CHA).
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JRE
Java Runtime Environment
JVM
Java Virtual Machine
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kVA
kilovolt-ampere
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LDEV
logical device