[mike_d]

us-east-1 is the largest region, so it is where changes meet scale.

It is also a massively complex beast in itself spanning dozens of datacenters with massive amounts of fiber between them. Much more fragile than having everything in a single building and as you scale up the number of components you increase the rate of failure.

[sofixa]

No AWS region is in a single building, they aren't amateurs like Azure. Each region is at least 3 AZs, which is at least one physical DC.

[yanellena]

And yet it's AWS that's down.

[sofixa]

Touché. Still I'd rate the overall reliability of AWS higher than Azure; and even if that weren't the case, security issues make Azure look like a very poor choice.