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Does this actually cause a disruption of service though? It seems like it would be trivial to just keep the configuration in place for 72 hours even after changing the DNS entry.

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They actually do that -- they keep the old IP live for a while to prevent problems with clients that might have cached the IP.

So could we not update the A records IP address every couple of hours and still get roughly speaking the benefit of load-balanced load-balancers?

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