Figure 1 is an overview of the conversion environment for backup processing. The following steps are recommended for converting to an automated tape library (ATL):

1. Fill the library with scratch tapes.
2. Set up the ACS routines to map all new backups to the library. For information on how to set up ACS routines, refer to z/OS DFSMS Implementing System-Managed Storage.
3. Mount the tapes. Mounts for recovery from previous backups will be manual but will phase out as more backup processing occurs within the automated tape library. Mounts for recovery from library processing occur within the ATL.
4. Eject connected sets if additional library space is required. If a DFSMShsm backup connected set has been ejected from the library, the ARCTEEXT installation exit can be used to dynamically insert tapes whenever they are needed.
5. Eject alternate volumes if they are not already outside the library. These tape volumes have been created as a result of TAPECOPY processing, and you can identify them by using the LIST TTOC SELECT (BACKUP FULL LIB(ALT)) command.
   Note: If your remote locations are creating tapes simultaneously, you may even have an entirely different set of tape management policies.

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