Set up all storage controls with PPRC operations so that PPRC routes SIM alert messages to a host console. Do not select “No Alerts”, as this option prohibits the storage control from sending any SIM alert messages to attached host systems. In the event of a subsystem failure that affects PPRC operation (such as a permanent error on a secondary volume), the subsystem must be able to alert an operator to the problem. This is especially critical at an unattended recovery site where a subsystem problem, if left unresolved, can jeopardize the entire PPRC copy operation.