AWS Compute Optimizer Review: Not Quite Rightsized for Rightsizing

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In December, AWS announced a new service called AWS Compute Optimizer that provides recommendations with the goal of properly sizing EC2 virtual machines. Rightsizing is one of AWS’s listed five pillars of cost optimization, and it’s good to see AWS following the trend of cloud providers making it easier for customers to optimize for cost and performance. Actually, this is not the first “rightsizing tool” they’ve promoted. Early last year they pushed what was essentially a collection of Python scripts in the AWS Solutions Portal called “AWS Right Sizing”.

As cloud cost optimizers here at ParkMyCloud, rightsizing is high on the list of optimization strategies we focus on. The ParkMyCloud platform offers rightsizing recommendations and actions, along with two other cost optimization pillars: “Increase Elasticity” through scheduled shutdown of idle resources, and “Measure, monitor, and improve” through cost and savings reports and an RBAC-enabled user portal. Let’s take a look at what the AWS Compute Optimizer offers, and how it compares to ParkMyCloud’s rightsizing.

AWS Compute Optimizer Overview

The AWS Compute Optimizer service generates size change recommendations based on your existing EC2 servers, including those that are in Auto Scaling groups. Each EC2 virtual machine can get up to 3 recommendations for different families and sizes that you could choose, along with the performance risk and costs associated with each option. While you are browsing the options, the interface will show you what the performance would have looked like over the past 2 weeks if you were running on the selected instance size instead of the current instance size, which is nice for analyzing the options against your organization’s risk profile. However, there is no direct way to take the Rightsizing action, so you must go and adjust the instance settings manually.

AWS Compute Optimizer is free of charge and available on all AWS accounts regardless of support level. You do have to choose to opt-in to use the service before recommendations will be made. A major limiting factor is the region availability: currently, AWS Compute Optimizer is available in US East (N. Virginia), US East (Ohio), US West (Oregon), EU (Ireland), and South America (Sao Paulo), and supports the M, C, R, T and X instance families. It uses only the past 2 weeks’ worth of Cloudwatch data to generate recommendations, which is a small window that may result in odd recommendations if those two weeks include any anomalies.

If your EC2 instances line up with this subset of instance types and regions, then the AWS Compute Optimizer can provide some suggestions for cost savings. However, if your needs are a little more diverse or robust, read on.

ParkMyCloud Rightsizing Overview

ParkMyCloud has offered scheduling of idle cloud resources since 2015. Last year we announced a major advancement in the platform’s cost optimization capabilities with the release of Rightsizing.

Similarly to the AWS Compute Optimizer, ParkMyCloud’s Rightsizing capabilities offer up to 3 recommendations for different sizes that your instances could be based on Cloudwatch data. Additionally, ParkMyCloud’s Rightsizing can:

  • ParkMyCloud is multi-cloud, multi-account, and multi-region in a single pane of glass, so you can view recommendations across all of your cloud accounts in one place (including all AWS regions, not just the ones listed above and Azure and Google Clouds)
  • ParkMyCloud can take the Rightsizing action for you once you accept a recommendation, including scheduling that resize action for a future time (such as during a maintenance window).
  • ParkMyCloud’s recommendations are based on data from a period of up to 24 weeks, providing a much more robust recommendation compared to the 2-week data set imposed by Cloudwatch.
  • ParkMyCloud makes recommendations for and resizes RDS databases, including Aurora instances. RDS databases have an average cost of 75% higher than EC2 instances, which means this is a significant opportunity for cost savings.
  • All AWS instance sizes are supported, not just M/C/R/T/X
  • Users can reject a recommendation and give an explanation, so administrators know why actions weren’t taken.
  • Savings from Rightsizing (and parking) are tracked and reported in ParkMyCloud, so you can show management or the CFO just how much money you’re saving the company.

To summarize:

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Optimize Your Rightsizing

The AWS Compute Optimizer is a great feature that AWS is offering for free to its cloud users, but the limitations and inability to take direct action from the recommendations makes it less useful for serious cost optimization. ParkMyCloud’s features make it the right choice for saving money on your cloud bill while optimizing performance, and the free trial makes it easy to get started today. Feel free to contact us if you have any questions.

Written by

CEO of ParkMyCloud

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