The SMFDATA DD statement specifies the name of the data set containing the sorted SMF type 89 records. These variable length SMF records must be pre-sorted into ascending character order starting at record position 5 (the first position after the 4 byte RDW) for a length of 250 characters. This statement is required, but may be a DUMMY statement under the appropriate circumstances, provided a block size is specified on the dummy statement, such as:

//SMFDATA DD DUMMY,DCB=BLKSIZE=4096