IMS ACB management coexistence considerations

Before you enable the IMS management of ACBs for the first time in a data sharing environment, migrate all IMS Version 13 and earlier systems in the data sharing group to the new IMS release.

After all IMS systems that share an IMS catalog are migrated to the new release, IMS systems that use DBD, PSB, and ACB libraries can coexist in the data sharing group with IMS systems that use IMS-managed ACBs. However, the ACB, DBD, and PSB libraries must be kept in sync with the IMS catalog. Changes made to databases and program views in an IMS catalog that is enabled for ACB management are not automatically propagated to IMS systems that still use ACB, DBD, and PSB libraries.

To ensure that the ACB, DBD, and PSB libraries are consistent with the resources in an IMS catalog that is enabled for IMS ACB management, use one of the following methods:

Use the IMS Catalog Library Builder utility (DFS3LU00) to create the ACB, DBD, and PSB libraries for the IMS systems that still require them from the active databases and program views in the IMS catalog. This method establishes the IMS catalog as the definitive source of active database and program views for all IMS systems. This is the recommended method.
Use the generation utilities to create the ACB, DBD, and PSB libraries for all IMS systems. Distribute them among the IMS systems that still require them and use them to populate the IMS catalog.