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When a scratch volume is requested for a new data set, Control-M/Tape can automatically direct the data set to an active volume that contains one or more files with attributes similar to the new data set.
Control-M/Tape analyzes characteristics (for example, retention criteria and vault patterns) of each new data set, and searches for a volume with data sets with matching criteria and enough free space. The new data set is then added to the volume. This process is called dynamic data set stacking.
This feature is controlled by the DYNSTK Control-M/Tape installation parameter and the DO STACK statement that must appear in a Control-M/Tape rule for the data set.
For a general description of the data set stacking logic, see the description of stacking in the organization and administration chapter of the Control-M/Tape User Guide. The following discussion assumes an understanding of the stacking algorithms and operation of Control-M/Tape.
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