Data-set-sequence-number
- data-set-sequence-number
- Identifies the relative position of a data set on a tape volume. Before z/OS® V1R5 the value of the data-set-sequence-number
on the LABEL parameter was limited to 9999. However, starting with z/OS V1R5,
the system allows data set sequence numbers up to 65535 for the following
media:
- Standard label (SL) tapes, including standard user label tape (SUL) and leading tape mark (LTM).
- Unlabled (NL) tapes.
- Bypass label processing (BLP)
- For uncataloged data sets, update the data set sequence number in the JFCB and use the OPEN,TYPE=J macro.
- For catalogued data sets, use the OPEN macro. The catalog provides the data set sequence number.
Omit this subparameter or code 0 or 1 to indicate the first data set on the tape volume. Also omit this subparameter for the following:- Cataloged data sets. The system obtains the data-set-sequence-number from the catalog.
- A DD DSNAME parameter that requests all members of a generation data group (GDG). The system retrieves the data-set-sequence-number from the catalog.
- A data set passed from a preceding step. The system obtains the data-set-sequence-number from the passing step.