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I have been trying to understand how AWS Reserved Instances works exactly reading AWS documentation and looking on Google but could find literal information about my concern.

Reading this (Reserved Instances ยป How You Are Billed) I understand that, hour based you can have 4 instances running 15 minutes and they will use a full hour from 1 reserved instance.

But if we have one Reserved Instance, what gives us 24h a day, if we have 4 instances running only 6h a day concurrently, will they use the 24h given by the Reserved Instance? Or will only one will use 6h and the other 3 instances will be billed as On Demand?

Thank you in advance.

froblesmartin
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1 Answers1

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6h of reserved usage, the rest on demand.

A "budget" of 3600 seconds of reserved usage that resets every clock hour. So technically 4 instances burned through the reserved hour 15 minutes in.

It is a compromise that rewards continuous usage, but also acknowledges that concurrent use exists.

John Mahowald
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