How IQIBUTIL uses virtual storage for tables and buffers

For all IEBCOPY supported commands, IQIBUTIL uses similar storage resources. For all other functions and enhancements it uses storage above 16 MB line.

When SIZE= and WORK= keywords (see IEBCOPY chapter in DFSMSdfp Utilities book) are not explicitly specified, IQIBUTIL dynamically calculates the optimal below 16MB line available storage and implicitly generates an appropriate WORK= parameter. When auxiliary work data set DDs SYSUT3 and SYSUT4 are missing, IQIBUTIL dynamically allocates them to accommodate the handling of very large partitioned data set directories.