A standard holder address space job log consists of the following DD names (example from JES2/SDSF):
NP DDNAME StepName ProcStep CrDate-CrTime O-Grp-N DSID Owner
SYSTSPRT TAURHLDP mm/dd/jjjj hh:mm:ss 102 TAUUSR
MAINTASK TAURHLDP mm/dd/jjjj hh:mm:ss 105 TAUUSR
JESYSMSG mm/dd/jjjj hh:mm:ss 4 TAUUSR
JESMSGLG mm/dd/jjjj hh:mm:ss 2 TAUUSR
JESJCL JES2 mm/dd/jjjj hh:mm:ss 3 TAUUSR
The JESYSMSG, JESMSGLG and JESJCL DD names are the standard names used by JES2.