On a regular basis, the main control monitor checks for the availability of all other monitors (secondary). If a secondary monitor is not available (has failed), the main control monitor first attempts to reactivate it on the same MVS image on which the failed monitor was originally running.

If after the first attempt to reactivate the failed monitor it does not become active, the main control monitor tries to reactivate it on the first MVS image listed in the monitor’s entry in member CTDPLEX. If this attempt fails, the main control monitor then attempts to reactivate the monitor on the next image on the list. If the reactivation attempt fails after trying all images on the list, the procedure begins again with the first image until the monitor is activated.

When the main control monitor attempts to start, modify, or terminate a secondary decollation or print monitor, it uses the following command:

where rte_name is the destination MVS image name as listed in member CTDPLEX.

If the restart flag is set to either N or is empty, no attempt is made to reactivate the failed monitor.