If a DFSMShsm host fails, all of its recall requests on the CRQ remain intact and eligible for processing by other active hosts. The coupling facility notifies the remaining connected hosts of the failure. In-process requests on the failed host remain on the queue and are available for other hosts to restart them.
If the failing host is processing a request from ML2 tape, then all requests from that tape cannot be selected until the failing host is restarted. The tape is marked as “in-use” by the failing host, and that indication will not be reset until the failing host restarts.