If for some reason (such as a system outage) SMS-managed temporary data sets are not deleted at end of job, DFSMShsm attempts to delete them during automatic primary space management. A flag in the data set VTOC entry indicates that a data set is temporary.
If no cross-system serialization exists, or if cross-system serialization is not performed for temporary data sets, an in-use temporary data set can be deleted. In a JES3 environment, the data set must be two days old before it can be deleted.