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Google's Transition from Single Datacenter, to Failover, to a Native Multihomed Architecture - High Scalability -

highscalability.com/blog/2016/2/23/googles-transition-from-single-datacenter-to-failover-to-a-n.html

From the page

Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.

Making a system work in one datacenter is hard. Now imagine you move to two datacenters. Now imagine you need to support multiple geographically distributed datacenters. That’s the journey described in another excellent and thought provoking paper from Google: High-Availability at Massive Scale: Building Google’s Data Infrastructure for Ads.