Pics or it didn't happen.

Failover means that when , lets say, The State of Missouri is destroyed in an act of clumsiness typical of that state and my rig is destroyed with it, my other rig either surrenders half of its tasks and takes on the tasks of the dead Missouri rig or it takes over in full by creating more instances to make up for those lost.  This is why I need huge logging space because the failover rig will have to collect data from the failed rig.  The colos provide 24/7 AC and backup power so I figured I might as well take advantage of them. 

Redundant means they are the same and have the ability to failover.