Cross-colo fail-over design, DNS level fail-over?

Question

I\'m interested in cross-colo fail-over strategies for web applications, such that if the main site fails users seamlessly land at the fail-over site in another colo.

Th

Answer 1

If you can, Multicast - http://en.wikipedia.org/wiki/Multicast or AnyCast - http://en.wikipedia.org/wiki/Anycast