You can effectively implement system-managed storage by migrating one part of your data at a time. Use any of the following methods:

• The implementation-by-milestone approach allows you to achieve an orderly, phased implementation. With this method, you develop classes and groups required for a class of data, such as TSO, and then code the corresponding ACS routines. Once you have migrated a class of data, modify your configuration to support an additional type of data until all your eligible data has been placed under system management. Your ACS routines can then evolve to manage more and more of your data sets.
• Convert all eligible data to system management. Make sure to assign proper management class policies to prevent, for example, DFSMShsm migration or backup of database data.
• Use facilities unavailable under non-SMS storage, including compression, striping, and extended addressability (>4 GB) VSAM.
• Use the DFSMS FIT approach as discussed in Using DFSMS FIT to Implement System-Managed Storage.