Traditionally, enterprises using the Amazon Web Services cloud leveraged Reserved Instances (RIs) to realize significant cost savings by committing to usage of a specific instance type and operating system within an AWS region.
More recently, AWS has introduced Savings Plans, an additional flexible pricing model for AWS compute services. Densify helps manage Savings Plans and RIs at enterprise scale by proactively determining the optimal strategies to leverage AWS Savings Plans and maximize cloud cost savings.
But how are these purchasing vehicles different? Let’s first look at what Savings Plans are and how they compare to Reserved Instances.
Savings Plans are AWS’ flexible pricing model that offers low prices on EC2 and Fargate for a commitment to a consistent amount of usage (measured in dollars per hour) over a 1- or 3-year term. When you sign up for Savings Plans, you will be charged the discounted savings plan price up to your commitment.
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For example, if you commit to $25 of compute usage an hour, you will get Savings Plans prices on that usage up to $25, and any usage beyond that commitment will be charged at the usual On-Demand rates.
AWS is offering two different types of Savings Plans:
This plan provides the most flexibility and can get you a cost reduction of up to 66% and automatically apply to EC2 and Fargate usage. This is drastically simpler than the previous RI’s as the discount applies regardless of instance family, size, AZ, region or tenancy. Now you don’t have to go through the time-consuming efforts to figure out the configurations before you commit.
For example, with a Compute Savings Plan you can change from a T3 to an M5 instance and shift the workload from the US to the EU region, and automatically continue to pay the savings plans price.
This plan provides the lowest prices and you can get savings up to 72% in exchange for commitment to usage of an instance family in a specific region (e.g. C5 usage in North Virginia). This automatically reduces your cost on the selected instance family and provides the ability to switch the OS, size, AZ, and tenancy (dedicated or default).
You can get started with AWS Savings Plans directly from the AWS Cost Explorer management console, or by using the AWS API/CLI. Savings Plans are available with three different payment options:
|Compute Savings Plans||EC2 Instance Savings Plans||Convertible RIs||Standard RIs|
|Savings over On-Demand||Up to 66%||Up to 72%||Up to 66%||Up to 72%|
|Low price in exchange for monetary commitment||Yes||Yes||No||No|
|Pricing automatically applies to any instance families||Yes||No||No||No|
|Pricing automatically applies to any instance size||Yes||Yes||No||No|
|Pricing automatically applies to any tenancy or OS||Yes||Yes||No||No|
|Automatically apply to Fargate usage||Yes||No||No||No|
|Pricing automatically applies across any AWS region||Yes||No||No||No|
|1- or 3-year term length options||Yes||Yes||Yes||Yes|
Overall, Compute and EC2 Savings Plans can offer greater flexibility in where discounts can be allocated.
Unfortunately, with this added flexibility, the Savings Plans cannot be sold in the RI Marketplace, and there is no separate marketplace for Savings Plans. This means that the spend per hour must remain at commitment levels for the term of the plan to capture all the savings.
Additionally, convertible RIs allow for increased commitment (purchase more RIs to cover additional Instances) during the contracted term, without the need to increase the term. This is helpful when needs change and committing to a new 1 to 3-year term doesn’t make sense. With Savings Plans any addition to the original contract is done with a new contract that starts from day 0.
Reserved Instances are not going away in the foreseeable future, and customers still have the option to choose between RI and Savings Plans commitments.
For your existing reservations, you will still need to proactively plan, manage, and optimize your Reserved Instance purchases and exchanges, and Densify has a robust solution to help.
Now, the big question that remains is how to best determine the correct commitment amount for the new AWS Savings Plans. Analysis of historical data and forecasting future usage and spend is extremely complicated.
The good news is that you don’t have to worry about manually analyzing the historical data to make a best guess at how to commit to the new Savings Plans. Densify is here to help!
Densify fully supports AWS Savings Plans. With our patented, predictive machine learning technology and our dedicated team of Cloud Advisors, we will empower you to make the optimal, well-informed decisions on how to best leverage Savings Plans, maximizing your overall cost savings.
Our advanced machine learning is able to analyze all your historical workload patterns, the available cloud resources, and all the rules for AWS Savings Plans and Amazon Reserved Instances to generate answers through multidimensional permutation analyses—ensuring you achieve high cloud elasticity at the lowest cost.
In addition, Densify continues to help our customers actively plan, manage, and optimize Reserved Instance purchases and exchanges, protecting and leveraging existing financial investments.
On a final note, we’d like to emphasize that ongoing evolutions by AWS perfectly align with Densify’s vision and mission, which is to empower you to buy and leverage the cloud more intelligently and cost-effectively.
To learn more on how Densify can help you achieve high cloud elasticity at the lowest possible cost, watch our training session featuring guest analyst Lauren Nelson from Forrester Research.Watch the Analyst Training