I am planning to start with small EC2 RESERVED instance with 3 year commitment. If in between I upgrade it to Large instance; will I be able to use my upfront payment I made for small instance ?
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I am planning to start with small EC2 RESERVED instance with 3 year commitment. If in between I upgrade it to Large instance; will I be able to use my upfront payment I made for small instance ?
Short answer: No.
Long answer: You cannot apply any payment on a reserved instance to another reserved instance. Once you have made the purchase you get the discounted rate for an instance that matches the exact instance type, operating system, availability zone. There are no refunds (though billing has been known to make exceptions immediately after a purchase).
Tip: Did you know that you can run instances on EC2 without purchasing a reserved instance? Thinking reserved instances are required is a common misconception based on the wording used in the AWS documentation.
Advice: Based on your question, I recommend you do not purchase any reserved instance for now, much less a 3yr reserved instance. Wait to see how your instance works on demand and later decide if you believe you will be running it for a year or three.