What is the Difference between a Light, Medium or Heavy utilization Reserved instances on EC2?

Question

They talk about the different utilization instances, but I can\'t find a single place that actually states what the difference is between a light utilization Large instance or a

Answer 1

The math here gets a little complicated. But, at the end of the day, it comes down to how many hours you'll be running instances for the reservation type/size/region that you have. It's gotten even more complicated now that you can trade in reservations for different AZ's and sizes.

There's a great blog series on choosing Reserved Instance types/quantities on the Cloudability blog.

http://cldy.co/choosing-ri-types

There's also a webinar recording that covers all the math:

http://cldy.co/ri-webinar-recording

Full disclosure: I work for Cloudability.