Why Amazon's Data Centers Are Hidden in Spy Country(theatlantic.com) |
Why Amazon's Data Centers Are Hidden in Spy Country(theatlantic.com) |
I want to point out one very important fact. AZ is logical. A typical AWS account would get, IRRC, up to 4 AZs. However, not all accounts is provisioned with the same set of AZs.
Account A: a, b, c, e Account B: a, c, d, e Account C: a, c, d, e
By logical, even though all three accounts have AZ "a", that "a" is not necessarily from the same data center (remember multiple DCs per region). It can be "a" in one of their us-east-1 DC#2, or DC#3. Though when m3.medium runs out in us-east-1 AZ "a", you will get full unavailability in all accounts running "a".