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or deleted from a tape library configuration, for
example, 3490E control unit, 3490E tape unit, storage
frame, or convenience I/O station.
unit emergency power off. A red switch on product
frame that, when operated in an emergency, causes all
subsystem frames to be disconnected from the ac
power source.
unit power off. A switch that removes all power from
a specific unit of the 3494 Tape Library.
unload. To remove cartridges from a device in the
3494 Tape Library.
UPO. See unit power off.
user interface VTS. During the library installation
Teach operation, the service representative selects one
of the VTSs in a Peer-to-Peer VTS configuration to be
the user interface VTS. This is the VTS that the user has
designated to perform library console operations, such
as logical volume volser creation.
V
vision system. A Class II laser bar code reader that is
mounted on the cartridge accessor picker. It is used to
read the bar code labels on the tape cartridges.
volser. Volume serial identifier. The physical label on
the cartridge. Also, the same or different identifier
encoded on the magnetic tape.
W
Write Once, Read Many (WORM). A technology to
allow data to be written once to storage media. After
that, data is permanent and cannot be altered, but can
be read any number of times.
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3494 Tape Library Operator Guide
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