IBM SC34-6814-04 - Manual (Page 773)

The label ‘MNSMFDS’ is the default DSECT name, and SMF is the default PREFIX
value, so you could also generate the DSECT simply by coding:
DFHMNSMF
The MNSMFDS DSECT has the format shown in Figure 105 on page 752.
Chapter 28. CICS monitoring 751