MAXSORT and Disk Sort have similar JCL requirements. To initiate MAXSORT using job control statements, specify PARM='MAXSORT' on the EXEC statement. A program-initiated sort requests MAXSORT by using a PARM card image in the data set defined by the $ORTPARM DD statement. In either case, it may be necessary to request additional main storage in order to use the MAXSORT technique.