Define a vital record specification to retain a volume based on the job name that created the data set. DFSMSrmm checks the job name in the vital record specification against the creating job name defined for each data set that matches the data set mask. The creating job name is the name of the job that created the data set and is defined to DFSMSrmm using the RMM ADDDATASET subcommand or DFSMSrmm ISPF dialog. DFSMSrmm uses the job name to retain the data set if a matching job name is found. If there is no creating job name for a data set, DFSMSrmm uses the volume job name to retain the data set. When no creating job name is known for a data set, the data set cannot be retained by vital record specification definitions that specify a job name mask.