- If you use DSN=NULLFILE on your DD statement for an input data
set, a system restriction prevents DFSORT from using the EXCP access
method.
- Empty input data sets can be used.
- If any of the input data sets are on tape without standard labels,
DCB parameters must be specified on their DD statements.
- ISO/ANSI Version 1 tape files can only be used as input—never
as output.
- DFSORT sets appropriate BUFNO values for the input and output
data sets; specifying BUFNO in the DD statements for these data sets
has no effect.
See SORTIN DD statement for additional considerations.