Virtual I/O

If a SORTWKdd data set is specified on a virtual device:

With VIO=NO: DFSORT performs dynamic reallocation using the ddname SORTDKdd on a real device with the same device type as the virtual device. If a real device corresponding to the virtual device is not available in the system, DFSORT terminates with an ICE083A message; see z/OS DFSORT Messages, Codes and Diagnosis Guide for more information about this error. Non-VIO SORTWKdd data sets are also reallocated when VIO SORTWKdd data sets are present.
With VIO=YES: the virtual device is used; performance may be degraded.
DFSORT work data sets cannot be allocated as large format data sets if VIO is used.

The following is an example of a SORTWKdd DD statement using a disk work: data set