When it comes to deploying an application in the cloud, many customers choose a region based on the proximity to their clients. However, proximity to the end users of your application is not the only criteria in determining an AWS region.
Here are some of the key factors that you need to consider when choosing an AWS region for your workload:
- High Availability
Cost for AWS services vary by region. If you choose an expensive region you could end up paying a lot more. Thankfully, Amazon has a Cost Calculator to get a rough estimate on your monthly costs based on the services you need.
Multi-region deployment is critical to provide low latency for end users. However, we need to keep in mind that each region has a different latency and data transfer speed.
Click on the image to see the dynamically populated inter region latency in milliseconds between all the AWS regions.
Image Credit: cloudping.co
Not all of the AWS services are available in all the regions. It will take much longer for new services to be available in some regions. So, making sure the regions that you choose have all the required services is important.
Below is a list of AWS services offered in different AWS regions. Click on the image to see the complete table.
Availability Zones are a collection of data centers in a region. They are connected to each other with fast, private fiber-optic networking, that enables to architect applications that automatically fail-over between Availability Zones without any interruption. So, Availability Zones are key to High Availability & Fault Tolerance.
Different regions have different number of Availability Zones (AZs). Some regions have only 2 AZs, while some have 3 or more. If you choose an AWS region that has only 2 AZs, if one of the Azs become unavailable then your application will be at risk because the only available AZ will be overloaded. If your application demands high availability you need to choose a region that has at least 3 Availability Zones.
It’s clear that there are multiple factors to consider when deciding on a suitable AWS region. Choosing your AWS region carefully can enable your applications to be high performant, highly available and cost-effective.