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 backup. In a JES3 environment, an SMS-managed temporary data set must be two days old before it can be deleted. These data sets must be as old or older than the integrity age, which is normally zero days, but can be one or two days.
For more information about data set integrity age, see Integrity age for space management.