User Manual

205Enterprise Virtual Array 3000 User Guide
glossary
Glossary
Glossary
This glossary defines Enterprise Virtual Array terms used in this publication or
related to this product and is not a comprehensive glossary of computer terms.
µm
A symbol for micrometer; one millionth of a meter. For example, 50 µm is equivalent to
0.000050 m.
3U
A unit of measurement representing three “U” spaces. “U” spacing is used to designate panel
or enclosure heights. Three “U” spaces is equivalent to 5.25 inches (133 mm).
See also rack-mounting unit.
active member of a virtual disk family
An active member of a virtual disk family is a simulated disk drive created by the controllers
as storage for one or more hosts. An active member of a virtual disk family is accessible by
one or more hosts for normal storage. An active virtual disk member and its snapshot, if one
exists, constitute a virtual disk family. An active member of a virtual disk family is the only
necessary member of a virtual disk family.
See also virtual disk, virtual disk copy, virtual disk family, and snapshot.
adapter
See controller.
AL_PA
Arbitrated Loop Physical Address. A 1-byte value the arbitrated loop topology uses to identify
the loop ports. This value becomes the last byte of the address identifier for each public port on
the loop.