The 8 services were really just the fundamental pieces to get, put, and manage incoming traffic. Most importantly, there are so many different tenets that come with S3, but durability, of course, trumps everything. The 11 9s (99.999999999%) that we promise our customers by replicating over 3 availability zones was unique. Most of our customers, if they have on-premises systems—if they’re lucky—can store 2 objects in the same data center, which gives them 4 9s. If they’re really good, they may have 2 data centers and actually know how to replicate over 2 data centers, and that gives them 5 9s. But 11 9’s, in terms of durability, is just unparalleled. And it trumps everything.

learnings from scaling AWS

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