Main storage space can be a problem when you invoke DFSORT from another program, especially if you use MAINSIZE/SIZE=MAX and invoke user exit E15 or E35 (or, from COBOL, use an input or output procedure). In this case, you usually receive a system ABEND 80A message.

If you invoked DFSORT from another program, and particularly if you opened a file in your user exit routine, check that you specified a sufficiently large amount of reserved storage with the RESALL, ARESALL, RESINV, or ARESINV run-time option.

For more detailed information on main storage, see z/OS DFSORT Application Programming Guide.