Use this section to isolate the probable source of a failure to an area within DFSMS or to the interfaces with ICKDSF or DFSORT. Because you are reading this information, the assumption is that you have performed problem source identification (PSI) and some measure of problem determination (PD), and you suspect that DFSMSdfp is related to the failure. Refer to z/OS Problem Management, z/OS MVS Diagnosis: Reference, and z/OS MVS Diagnosis: Tools and Service Aids for PSI and PD information.