Switching from an old T2 instance to a T3 or T3A instance will lower the costs by 7% to 12%.
if you have an old T2 instance you cannot switch to a T3 or T3A instance without a migrationAWS Documentation
that is: create a new instance and migrate your data over there. This is a real headache for the server configuration and settings. Trying to do so usually result in the following error:
Error launching source instance: InvalidParameterCombination: Enhanced networking with the Elastic Network Adapter (ENA) is required for the ‘t3.large’ instance type. Ensure that you are using an AMI that is enabled for ENA.
However we have found out a way to patch any T2 instance AMI and convert it to a T3 or T3A instance. It will work with any instance running CentOS (including WHM®/cPanel®). Contact us if you need such job done! A flat fee per instance will apply.