Marco Massenzio
1 min readApr 2, 2019

An AZ is *not* a Region — each Region is composed of several (from 2 in `us-west-1`, up to 5, in some AP regions) AZs.

So, stating that Atlas allows replicas across AZs, and DocumentDB across “just one Region” is a distinction without a difference: I don’t know if that’s a typo (and Atlas indeed allows replication across Regions) but then I’d like to know latency guarantees (AWS Regions are fully independent of each other, so even having a single VPC spanning Regions is not possible)

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Ok — it turns out that Atlas does support Multi-Region deployments: https://docs.atlas.mongodb.com/faq/#do-you-support-cross-region-deployments
so that’s a definite plus v. DocumentDB (although, as mentioned, it would be good to know what latency guarantees provides etc.)

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