tape cartridge when it prepares
(initializes) the cartridge for use.
VPD See vital product data.
W
W Watts.
watt A metric unit of measure of power; the
power required to keep a current of one
ampere flowing under a potential drop of
one volt; about 1/736 of one horsepower.
Web See World Wide Web.
wet bulb temperature
The temperature at which pure water
must be evaporated adiabatically at
constant pressure into a given sample of
air in order to saturate the air under
steady-state conditions. Read from a
wet-bulb thermometer.
World Wide Node Name
In Fibre Channel technology, the fixed,
64-bit name assigned to a device by its
manufacturer and used to identify
participants in a topology. The World
Wide Node Name will be unique if the
manufacturer has registered a range of
addresses with the IEEE.
World Wide Port Name
Within a parent node, a unique 64-bit
name that is assigned to a node port. The
World Wide Port Name aids the
accessibility of the port.
World Wide Web
A network of servers that contain
programs and files. Many of the files
contain hypertext links to other
documents available through the network.
WORM
See write once read many.
write To make a permanent or transient
recording of data in a storage device or
on a data medium.
write once read many (WORM)
A technology that allows data to be
written only once to LTO Ultrium 3, 4,
and 5 tape cartridges and 3592 tape
cartridges. After being written, the data
cannot be altered, but can be read any
number of times.
write protected
A tape cartridge is write protected if some
logical or physical mechanism causes the
device that is processing the tape to
prevent the program from writing on the
tape.
write-protect switch
Located on the LTO Ultrium and 3592
tape cartridges, a switch that prevents
accidental erasure of data. Pictures of a
locked and unlocked padlock appear on
the switch. When you slide the switch to
the locked padlock, data cannot be
written to the tape. When you slide the
switch to the unlocked padlock, data can
be written to the tape.
X
X-axis and Y-axis motion assemblies
Within the TS3500 Tape Library, a group
of parts that provides the motive force to
move the accessor side to side (on the
X-axis) and up and down (on the Y-axis).
Y
Y-axis motion assembly
See X-axis and Y-axis motion assemblies.
Z
zoning
A method of subdividing a storage area
network into disjoint zones, or subsets of
nodes on the network. Storage area
network nodes outside a zone are
invisible to nodes within the zone.
Moreover, with switched SANs, traffic
within each zone may be physically
isolated from traffic outside the zone.
254 IBM System Storage TS3500 Tape Library with ALMS: Introduction and Planning Guide
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