Yeah, it's got to be much larger than the other regions, so it makes sense that we see more errors. Since error_rate = machines * error_rate_per_machine.
No, I calculated the error rate for the region. If us-east-1 has 5 times the machines (or availability zones, or routers, or EBS backplanes, or other thing-that-can-fail) as us-west-1, we would expect to see us-east-1 have each type of error occur about 5 times as often as us-west-1.
