Glossary
Scalar i500 User’s Guide 556
TCP/IP (Transmission Control Protocol/Internet Protocol)
The
communications protocol used by the Internet. It runs on top of Ethernet
to provide high-level networking services to applications.
Topology The logical and/or physical arrangement of stations on a
network.
Trap An SNMP alert that is sent when predefined conditions are met.
For example, an error trap tests for an error condition and provides a
recovery routine.
U
UDS (Universal Drive Sled) The hardware that houses Fibre Channel and
SCSI tape drives in a module.
User ID An alphanumeric value that the password database associates
with a login name. Also, UID.
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.
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