This recall process returns a migrated data set from a ML1 or ML2 volume to a DFSMShsm-managed volume. When a user refers to the data set, DFSMShsm reads the system catalog for the volume serial number. If the volume serial number is MIGRAT, DFSMShsm finds the migrated data set, recalls it to a DFSMShsm-managed volume, and updates the catalog. The result of the recall process is a data set that resides on a user volume in a user readable format. The recall can also be requested by a DFSMShsm command.

Figure 1 shows the recall paths of data sets managed with and without system-managed storage.

Figure 1. Automatic recall

For system-managed environments, DFSMShsm invokes the automatic class selection routines to determine whether a data set should be recalled as managed with or without system-managed storage. Automatic class selection chooses the storage group to which the data set is recalled. The system chooses the specific volumes where the data set will reside, from the storage groups.

For non-system-managed environments, DFSMShsm returns a migrated data set to the DFSMShsm-managed volume with the most free space or to a specified target volume.