The z/OS Network File System uses trace facilities to record debug trace diagnostic information when a problem requires additional diagnostic information beyond diagnostic messages. Assuming that debug trace diagnostics were not activated at the time of the original failure, the problem must be recreated a second time and the NFS debug trace facilities turned on to capture the diagnostic information. The server provides debug trace diagnostic information from one trace facility. The z/OS Network File System client provides debug trace diagnostic information from one trace facility.