DNS Failover?

I'm working on a product that will require impressive uptime.

I'm looking for creating several static servers to relay content, but I will obviously need to have them setup with failover. Round Robin isn't an option.

I heard systems like zoneedit let you put a list of IP's to be accessed from, but ten minutes for detection seems kind of steep? Anybody know of any other services that offer this system? How does it work, and would it make sense to run your own?

 

 

 

 

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