Figure 1 is an overview of the conversion environment for control data set backup processing. The following steps are recommended for converting to an ATL:

1. Fill the library with scratch tapes.
2. Set up the ACS routines to map control data set backup versions to the library. In order to create original and alternate tapes in the same or different locations, ACS routines must filter on both data set names. For information on how to set up ACS routines, refer to z/OS DFSMS Implementing System-Managed Storage.
3. CDS backup versions never need to be ejected because old versions roll off and become scratch tapes as they are replaced with current versions.

Figure 1. Overview of Implementing Control Data Set Backup in an Automated Tape Library