User's Guide

Glossary
Scalar i500 User’s Guide 551
UTC (Coordinated Universal Time)
The world-wide standard for time,
commonly considered to be the equivalent of “Greenwich Mean
Time” and “Zulu time.” For all of these time standards, zero (0)
hours is midnight in Greenwich England, which lies on the zero
longitudinal meridian. The sequence of the letters in the acronym
is a compromise between the English and French terms (Temps
Universel Coordonné).
W
WORM (Write Once, Read Many)
A common type of data storage
medium, in which data can be read and reread, but not altered,
after it has been recorded.
WWNN (World Wide Node Name) A unique number assigned by a
recognized naming authority. The World Wide name is integral
to Fibre Channel operations.
WWPN (World Wide Port Name) The WWPN is a 64-bit, hard-coded
address for each port on an FC-connected device. It is used to
identify available SAN devices at end points.
X
X-axis, X-position
The horizontal position of the library’s robotic arm.
Y
Y-axis, Y-position
The vertical position of the library’s robotic arm.