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 3 and later LTO
tape cartridges and all 3592 tape
cartridges. After the data is written, it
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
On LTO 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 TS4500 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 might be physically
isolated from traffic outside the zone.
190 IBM TS4500: Introduction and Planning Guide
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