Read the section on determining the real-time system status for more information.
The set_role command will send email and pager messages to report the change of status.
In the event that the machine which was Active crashes and is not available for login, you can proceed immediately to make the former Standby machine into Active. Whenever a real-time machine boots, it will set its status to Standby as part of the startup process. This will cause email and pager messages to be sent announcing that the booted machine is Standby.
After doing a Active-Standby switch of the real-time systems, it is important to switch the post-processing systems so they are running on the same side of the Bay as the Active real-time system, mentioned in the list above. Otherwise database replication problems are likely to happen.