- Newest
- Most votes
- Most comments
I took a good look at the numbers on Bills and also in Cost Explorer. So this wasn't a a 'double billing' situation. Turns out I wasn't looking at it the right way.
On 8th July, when I purchased Convertible RI, 8 hours had already passed and I was charged On-Demand rate for those 8 hours. After that moment, I was charged the Convertible RI rate.
On 12th July, when I looked at the Bills dashobard, the trend indicated UP 64.8% since same time last month. If I had looked on 9th July, I would've seen something like UP 80% since same time last month. This is because the entire Convertible RI price was charged 100% on 8th July. We pay for every second of the month, irrespective of the number of running hours.
All clear. No problems. Hope this helps anyone else who gets spooked easily when inspecting their bills.
Hello, check these steps to resolve the issue
There are a couple of things to consider regarding your AWS bill with the new Convertible Reserved Instance (RI):
Understanding the Bill:
Double Billing: It's unusual to see both On-Demand and RI charges for the same instance hour. This could be a temporary glitch or a configuration issue.
Resolving the Issue:
- Contact AWS Support: The best course of action is to contact AWS Billing Support to clarify the double billing for the same instance hour. They can investigate the issue and ensure your RI discount is applied correctly.
- Review RI Coverage: Double-check if your Convertible RI covers the instance type, region, and usage patterns (hours per day/month) of your on-demand instances. You might need to adjust the RI configuration if there's a mismatch.
AWS documentation on Convertible RIs: https://docs.aws.amazon.com/whitepapers/latest/cost-optimization-reservation-models/standard-vs.-convertible-offering-classes.html
AWS Cost Management documentation: https://aws.amazon.com/aws-cost-management/details/
Contact AWS Billing Support: https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/billing-get-answers.html
I'm glad you sorted it out! As I was just about to explain the same :) The RIs are billed on a pro-rated basis each month, so if you purchased them on the 8th, you would only pay the RI rate for the remainder of the month. And you'd have to pay for the RI regardless of the running instances (even if it's not applying to any instances).
Yes, you would see the on-demand charges for the instance that you were running before you bought RIs. The discount doesn't apply retrospectively, so that's intended.
And also, the billing works hourly - every hour the system checks which instances you're running, and which RIs you have, and then applies a discount respectively. If you stop your instances for some time, the RI will not apply and you technically lose your discount for those hours.
Some people think that you purchase just a number of RI-hours for a month, and then as long as you run X number of instance-hours during that month, you're sorted. But in practice the billing has to be continuous. You either have to run those instances continuously for the discount to apply each hour, or otherwise the RI will have no instances to apply to... in which case you lose those RI-hours...
Relevant content
- asked 3 months ago
AWS OFFICIALUpdated a year ago- AWS OFFICIALUpdated 2 years ago
- AWS OFFICIALUpdated 3 years ago
- AWS OFFICIALUpdated 3 years ago
