115
TB terabyte
TID target ID
TPF Transaction Processing Facility
TSO Time Sharing Option (an IBM System/370 operating system option)
UCB unit control block
UL Underwriters’ Laboratories
VDE Verband Deutscher Elektrotechniker
VM Virtual Machine (an IBM S/390 system control program)
VOLID volume ID
volser volume serial number
VSC Volume Size Configurator (also called CVS: Custom Volume Size)
VSE Virtual Storage Extension (an IBM S/390 operating system)
VTOC volume table of contents
XA System/370 Extended Architecture
XDF Extended Distance Feature (for ExSA channels)
XRC Extended Remote Copy
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