MACROMEDIA COLDFUSION MX-CLUSTERCATS Use Manual page 37

However, before the analysis and repair can occur, the administrator must be notified.
Whatever failover system you put in place, it should include an automated notification
system that can route alerts through your telecommunications infrastructure (e-mail,
pagers, real time Web-based alerts, and so on) to the appropriate administrator for
prompt attention.
Besides notifying the administrator that a problem has occurred, you also want your
failover solution to automatically redirect traffic intended for the unavailable server to
other available servers until the unavailable server is fixed. This crucial corrective action is
what keeps your website up and available to your users even if one of the servers
supporting it is experiencing problems.
What is website availability? 27