Savings Plans are a flexible pricing model from Amazon Web Services (AWS) that enables you to significantly reduce costs for using Amazon Elastic Compute Cloud (EC2), AWS Fargate, and AWS Lambda compared to On-Demand pricing. Unlike Reserved Instances, which are tied to specific instances or regions, Savings Plans are tied to a "commitment" you choose. This means you pay a lower rate for a specified amount of usage, regardless of the specific resources you use within the scope of your selected Savings Plan.
There are two main types of Savings Plans: Compute Savings Plans and EC2 Instance Savings Plans.
Compute Savings Plans: Offer the most flexibility, covering EC2, Fargate, and Lambda usage across all regions and instance sizes.
EC2 Instance Savings Plans: Are suitable for those who want flexibility in using EC2 instances within a specific region and can change the size of the instance within the same family.
Both types can help you reduce costs, depending on your usage patterns and commitments you choose.
Paying for EC2 on-demand is paying for the resources you use, which is highly flexible but the most expensive. Savings Plans provide discounts for pre-defined usage. You pay a lower price compared to on-demand and get more flexibility than Reserved Instances.
On-Demand: Suitable for fluctuating usage, high flexibility, and no long-term commitment, but with the highest hourly price.
Savings Plans: Suitable for consistent usage, cost savings, and more flexibility than Reserved Instances. You get higher discounts compared to On-Demand.
Reserved Instances: Suitable for fixed usage, long-term commitment, and the highest discounts but less flexibility than Savings Plans.
In summary, Savings Plans offer a balance between flexibility and discounts, making them an attractive option for those who want to save costs without sacrificing flexibility.
Savings Plans provide discounts by setting a "commitment" amount that you will pay per hour for one or three years. When you use fewer resources than your commitment, you will still pay the commitment amount. However, when you use more resources than your commitment, the excess is charged at the On-Demand rate.
For example, if you choose a commitment of $10 per hour and you use resources worth $8 per hour, you will still pay $10 per hour. But if you use resources worth $12 per hour, you will pay $10 per hour for the commitment part and another $2 per hour for the excess at the On-Demand rate.
Therefore, choosing a commitment that matches your usage is crucial to maximize your discounts and avoid paying the excess at the On-Demand rate.
How to Use and Considerations for EC2 Instance Savings Plans
Choosing the right Savings Plan is essential to get the most out of the discounts. You should consider the following factors:
Usage Volume: Analyze your past EC2 usage to estimate how much commitment you should choose.
Flexibility: If you need flexibility in using multiple instance types or across multiple regions, Compute Savings Plans may be a better choice. But if you need flexibility within the same EC2 instance family, EC2 Instance Savings Plans may be sufficient.
Commitment Term: If you are confident in your long-term usage, a 3-year commitment will give you a higher discount. But if you are unsure, a 1-year commitment may be a safer option.
Regular Monitoring: Monitor your usage regularly to adjust your commitment to match your actual usage.
You can purchase and manage Savings Plans through the AWS Management Console or the AWS Command Line Interface (CLI). The general steps are as follows:
Usage Analysis: Use Cost Explorer or other AWS tools to analyze your EC2 usage.
Savings Plan Selection: Choose the appropriate Savings Plan type (Compute or EC2 Instance), region, commitment term, and commitment amount.
Purchase Verification: Review the purchase details and confirm the order.
Management: Monitor your usage and adjust your commitment as needed.
AWS also provides many tools and guidelines to help you make informed decisions and manage your Savings Plans effectively.
Although Savings Plans offer many benefits, there are some precautions and limitations you should be aware of:
Commitment: When you purchase Savings Plans, you are committed to paying the specified amount, whether you use the resources or not. Therefore, you should choose a commitment that matches your usage.
Commitment Changes: You cannot change your commitment after you purchase Savings Plans. Therefore, you should consider carefully before making a decision.
Cancellation: You cannot cancel Savings Plans. You will have to wait until the commitment period ends.
Regular Monitoring: You should monitor your usage regularly to ensure you are using Savings Plans effectively.
Understanding these precautions and limitations will help you use Savings Plans effectively and avoid potential problems.
Choosing the wrong commitment: Choosing a commitment that is too high may cause you to pay for resources you are not using, while choosing a commitment that is too low may cause you to pay for the excess at the On-Demand rate.
Not monitoring usage: Not monitoring usage regularly may prevent you from knowing if you are using Savings Plans effectively.
Misunderstanding the Savings Plan type: Choosing a Savings Plan type that does not match your needs may prevent you from getting the maximum discount.
วิธีแก้ไขปัญหา
การวิเคราะห์ข้อมูล: ใช้เครื่องมือ Cost Explorer เพื่อวิเคราะห์การใช้งานของคุณและเลือกข้อผูกพันที่เหมาะสม
How are Savings Plans different from Reserved Instances?
Savings Plans are more flexible than Reserved Instances. Savings Plans are not tied to a specific instance or region but are tied to a spending commitment, allowing you to adjust your usage as needed. Reserved Instances are tied to a specific instance and region.
Should I choose Compute Savings Plans or EC2 Instance Savings Plans?
If you need flexibility in using EC2, Fargate, and Lambda across multiple regions and instance sizes, Compute Savings Plans are a better choice. But if you need flexibility in using EC2 instances within a specific region and instance family, EC2 Instance Savings Plans are sufficient.
What happens if I use more resources than my commitment?
If you use more resources than your commitment, the excess will be charged at the On-Demand rate. Therefore, choosing a commitment that matches your usage is crucial.
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