Have you heard people talking about purchasing Reserved Instances (RIs) but you don't know where to start? Maybe you've been purchasing RIs but don't have a good way of checking their utilisation. Maybe you're somewhere in between and you need help to figure out where to focus your efforts. Because we know RIs are hard, we created a new page to help you get a better understanding of Reserved Instances and how they can help save you money. 

View the percentage of your EC2 spend that is covered by RIs. 

Because purchasing Reserved Instances in advance often comes with a substantial discount, they can save you a lot of money. There's no 'magic number', but it's generally safe to plan on at least 30% coverage. This should be on servers that run 24/7. If If you purchase too much, you're going to be wasting any hours that go unused. It's a balancing act, but there are generally safe ways of going about it.

Where to focus your efforts

Trying to purchase RIs for everything can be hard, and it's hard to know where to start, that's why we've taken the guesswork out. Start where the biggest red dot is to get the biggest return.

What RIs to purchase to reduce spend

Want more details to help you make your RI decision? Click on the instance type and we'll give you more detailed data on 

Things to keep in mind before taking the RI plunge

When you're purchasing RIs, you generally lock in 12, 24 or 36 months of a specific instance type. You're going to be getting a discount for committing upfront, but be sure that you weigh these factors in before making your decision.

  • You can be penalised if you change your instance type down the track, so make sure that you're confident that your spend for that instance type will either stay the same or increase for the period for which you're purchasing. This also applies if an instance type gets updated.
  • If you know your infrastructure is going to change significantly, it's probably not a good time to buy. Wait until things settle down and you have some predictability.
  • AWS prices tend to reduce over time. When you buy an RI, you're locking that price in, so you won't be able to take advantage of any price drops.
  • Our recommendations are just that. We only look at your an account from an API level. You know your infrastructure better than we ever could, so please ensure that you do a sanity check on our recommendations before taking action.

Not seeing these recommendations? If you're not using the most up-to-date version of our IAM role, you'll need to update it to be able to see our recommendations. Check out this article to find out how to update your roles.

As always, if you have any questions about Stax or any requests, please email us at support@stax.io

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