WAIT | NOWAIT are mutually exclusive, optional parameters you use to specify whether to wait for the HRECALL command to complete.

WAIT specifies that you want to wait for the HRECALL command to complete. If you are recalling data sets from tape, we recommend that you specify the NOWAIT parameter because the operator must mount the tape before the recall can complete.

When DFSMShsm successfully completes the HRECALL process, an ARC1000I message is issued. If the HRECALL process does not complete successfully, an ARC1001I message is issued. If you press the TSO Attention key before DFSMShsm completes the command, DFSMShsm issues an ARC1800I message and does not issue an ARC1000I message.

NOWAIT specifies that you do not want to wait for the HRECALL command to complete. When DFSMShsm successfully receives the request, an ARC1007I message is issued. If you are recalling data sets from tape, a volume mount request message (ARC0612I) is issued. After DFSMShsm successfully completes the HRECALL command, an ARC1000I message is issued. If the HRECALL command does not complete successfully, an ARC1001I message is issued.