Certain CDS records are used to serialize resources needed by tasks running on different processors. The records used for the serialization have a host ID field. When this field in a record contains ‘00’, it is an indication that no processor is currently serialized on the resource.

If DFSMShsm is unable to update a record to remove the serialization, the related resource remains unavailable to DFSMShsm tasks running in other processors until the host ID field of the record is reset. Unavailability of DFSMShsm resources can occur if DFSMShsm or MVS™ abnormally ends while a record is serialized with its identification. Use the LIST HOST command to list all CDS records containing a specified processor identification in the host ID field. After examining the list, use the LIST command again with the HOST and RESET parameters to reset the host ID field of the record.