Explanation: DAOPTION(SAMETRK | RELTRK | RELBLK) are mutually exclusive, optional parameters specifying the type of data set accessing required (relative track or relative block) upon recovery of a direct access data set. This, in turn, implies the allowable target volume device types.
| Subparameter | Explanation |
|---|---|
| SAMETRK | Data is moved as a track-to-track image and the target volume track size must be the same as the L0 volume from which the data set was backed up. If DFSMShsm is directed to a specific volume by the TOVOLUME parameter, this volume must have the same track length as the L0 volume from which the data set was backed up. Data can be accessed for both relative track and relative block processing. |
| RELTRK | Data is moved as a track-to-track image and the target volume track size must be the same or greater than the L0 volume from which the data set was backed up. If DFSMShsm is directed to a specific volume by the TOVOLUME parameter, this volume must have the same or greater track length as the L0 volume from which the data set was backed up. Data can be accessed for relative track processing. |
| RELBLK | Data is moved to fill out the track and the target volume track size can be the same, greater, or smaller than the L0 volume from which the data set was backed up. Data can be accessed for relative block processing. |
Defaults: If DAOPTION is not specified, the data is moved as a track image, allowing for relative track accessing.