Using the Basic Components › Automated Tape Data Set Stacking › Stacking to Virtual Volumes

Stacking to Virtual Volumes

If more than one data set is written to a Virtual Volume, all data sets on the volume are assigned to the same group as the first data set on the volume. The data set name or Data Class filter lists may indicate that these data sets should be assigned to different groups, but this will be overridden.

The override is required because Externalization works at the Virtual Volume level. It is a Virtual Volume that is queued for externalization and stacked, not the individual data sets.

Subgroup assignment is also overridden when multiple data sets are written to a Virtual Volume. The data set with the longest retention period determines which subgroup is assigned to the Virtual Volume.