Recall returns a migrated data set to a user volume (level 0). If you want to recall your own migrated data sets, you can do so without knowing where your data sets reside. To provide interactive terminal users with quick access to their migrated data sets, DFSMShsm allows up to 15 concurrent recall tasks.

Automatic recall returns your migrated data set to a DFSMShsm-managed volume when you refer to it.

Command recall returns your migrated data set to a user volume when you enter the HRECALL command through an ISMF panel or by directly keying in the command.

For both automatic and command recall, DFSMShsm working with SMS invokes the automatic class selection (ACS) routines. Data sets that were not SMS-managed at the time they were migrated may be recalled as SMS-managed data sets. The ACS routines determine whether the data sets should be recalled as SMS-managed, and if so, the routines select the classes and storage groups in which the data sets will reside. The system chooses the appropriate volume for the data sets.

DFSMShsm working without SMS returns a migrated data set to a DFSMShsm-managed non-SMS volume with the most free space.

See Figure 1 and Figure 2 for an overview of the flow for the automatic migration and the automatic recall functions.

Figure 1. Flow of Automatic Migration

Figure 2. Flow of Automatic Recall