Example

A user checks in an external volume whose volser is 111111 that is identical to an already existing volume in the Media Database.

The user assigns a new, unique value, NEW111, to field VOLSER in the Check-In screen, and places value 111111 in field SL-NAME. In addition, the user can place a gummed label specifying volser NEW111 on the checked-in volume.

When next requesting this volume, the user specifies volser NEW111.

Normally, MVS would determine that the volser on the volume’s standard label (111111) does not match the requested volser (NEW111), and would reject the volume. However, Control-M/Tape recognizes that the SL-NAME and VOLSER do not match, and it performs its own checks.

Control-M/Tape determines that the value in field SL-NAME matches the volser in the mounted volume’s standard label (111111), so Control-M/Tape allows the volume to be accepted by the operating system.

The volumes are identified as follows.

Table 181 SL-NAME Concept Example

When you introduce a range of volumes with duplicate volsers, you can use utility CTTDLD to automatically assign values to the VOLSER and SL-NAME fields of each of the volumes. For more information, see utility CTTDLD in the INCONTROL for z/OS Administrator Guide.