Point of fact: An AWS region is actually more than one DC. Mumbai has two availability zones which implies at least two DCs.
Also, Azure India regions are not generally available:
"The India regions are available to volume licensing customers and partners with a local enrollment in India. The India regions will open to direct online Azure subscriptions in 2016."
AWS actually operates 5 independent data centers (called availability zones) within the same complex that make up the us-east-1 region. This makes them significantly more likely to experience an outage in 1 availability zone, but also makes it much easier to architect around the problem.
For the record according to this link, https://aws.amazon.com/about-aws/global-infrastructure/ AWS operates in 18 geographies (called) regions... These are not data centers. There are 55 availability zones (AZs) at AWS regions, and each AZ has at least 1 data center..12 more AZs at 4 more regions are also announced
It seems a bit nit-picky, but AWS has ~18 commercial regions, but far more datacenters. It's availability zone that's a data center (more or less), not a region. So for each region you end up with 3 to 5 data centers or something like that.
Each Availability Zone can be multiple data centers.At full scale, it can contain hundreds of thousands of servers. They are fully isolated partitions of the AWS global infrastructure. With its own powerful infrastructure, an Availability Zone is physically separated from any other zones. There is a distance of several kilometers, although all are within 100 km (60 miles of each other).
Don't forget the availability zones! Each region has 2-4 availability zones, and each of these has 1-6 datacenters. The scale of AWS is at least an order of magnitude more important than OVH's.
I purposefully didn't use Amazon's wording because it would be confusing to someone who doesn't know about AWS.
An "availability zone" is an isolated data center. A "region" is a group of availability zones that are geographically isolated but somewhat close to each other.
For instance, three availability zones (data centers) that are within 100 miles (making up a distance) would make up a region.
US-EAST-1 is the oldest, largest, and most heterogeneous region. There are many data centers and availability zones within the region. I believe it's where AWS rolls out changes first, but I'm not confident on that.
What do you mean by 'geographically diverse'? AWS has a model of 'availability zones' and regions. A region like us-east-1 means a bunch of AZs (a.k.a. datacenters) that are close to each other.
S3 (and most AWS services) copies your data across multiple AZs but they are all pretty close together.
They are separate datacenters, I don't think they make any promises about how far they are apart from each other, but at least in some regions they are 10+ miles apart.
The AWS Cloud infrastructure is built around AWS Regions and Availability Zones. An AWS Region is a physical location in the world where we have multiple Availability Zones. Availability Zones consist of one or more discrete data centers, each with redundant power, networking, and connectivity, housed in separate facilities
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