//ddname DD VOLUME=(PRIVATE,RETAIN,...),...
//ddname DD VOLUME=(PRIVATE,...),...
//ddname DD VOLUME=(,RETAIN,...),... RETAIN support
RETAIN can be specified only for tape.
In a JES3 system, RETAIN is supported only by MVS™. If coded on a DD statement for a data set on an MVS-managed tape device, the system designates the volume as retained. If coded on a DD statement for a data set on a JES3-managed tape device, JES3 ignores the RETAIN parameter when issuing KEEP/RETAIN messages and when performing unallocation at the end of the job. However, if RETAIN is coded for a data set on a JES3-managed tape device and the tape volume is to be shared with a later step, JES3 designates the volume as retained.