I want to lower my Amazon EC2 bill, but I'm not sure if purchasing more Reserved Instances would help. How do I know if purchasing more Reserved Instances would lower my bill?

First, analyze your EC2 usage to see how many on-demand hours you're using (that is, hours that are not covered by Reserved Instances). Use Cost Explorer's Reserved Instance Coverage views to help you understand which instances on your account aren't fully covered by Reserved Instances.

Next, consider how and when you're using instances. Reserved Instances are best for workloads that meet the following criteria:

  • Steady-state or long-term (for example, an instance that runs 24 hours a day, 7 days a week for the foreseeable future)
  • Predictable (for example, runs every day at a certain time for a fixed amount of time)
  • Uses the same instance type in the same AWS Region

If your workloads meet all of these criteria, consider a Standard or Convertible Reserved Instance.

If your workloads don't meet all of these criteria, but your use case allows you to predict when you'll need temporary instance capacity, consider a Scheduled Reserved Instance.

If your workloads don't meet any of these criteria, Reserved Instances might not be right for your use case. Consider using Spot instances or purchasing a shorter Reserved Instance term on the Reserved Instance Marketplace.


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Published: 2017-04-26