understand the commitment you are making to pay for the entire 1-3 years
Amazon just announced a change in the way that Reserved Instances are sold. Instead of selling the old Reserved Instance types:
- Light Utilization
- Medium Utilization
- Heavy Utilization
EC2 is now selling these new Reserved Instance types:
- No Upfront
- Partial Upfront
- All Upfront
Despite the fact that they are still called “Reserved Instances” and that there are three plans which sound like increasing commitment, the are not equivalent and do not map 1-1 old to new. In fact the new Reserved Instances are not even increasing commitment.
You should forget what you knew about Reserved Instances and read all the fine print before making any further Reserved Instance purchases.
One of the big differences between the old and the new is that you are always committing to spend the entire 1-3 years of cost even if you are not running a matching instance during part of that time. This text is buried in the fine print in a “**” footnote towards the bottom of the pricing page: