The following identifies the phases of UNLOAD processing and the zones and data sets SMP/E may require for exclusive or shared use during each phase. For more information about command phases and data set sharing in SMP/E, see Sharing SMP/E data sets.

1. Initialization

   Global zone

   Read without enqueue.

   Target zone

   Read without enqueue.

   DLIB zone

   Read without enqueue.

   Note: Either the target zone or the distribution zone is used during setup according to the zone type specified in the previous SET command.
2. UNLOAD processing

   Global zone

   Read with shared enqueue.

   Target zone

   Read with shared enqueue.

   DLIB zone

   Read with shared enqueue.

   Note: The zones used depend on the UNLOAD command operands, and the zone type specified in the previous SET command.
3. Termination

   All resources are freed.