If the per-hour usage rate does increase, you may continue to use your Reserved Instance with Windows or Red Hat Enterprise Linux with the new per-hour usage rate, convert your Reserved Instance with Windows or Red Hat Enterprise Linux to a Reserved Instance with Linux/UNIX, or request a pro rata refund of the upfront fee you paid for the Reserved Instance with Windows or Red Hat Enterprise Linux. ![]() Any such changes for Red Hat Enterprise Linux would be made at least 30 days’ notice. ![]() The initial one-time payment for a Reserved Instance will be unaffected in this situation.Īny such changes for Windows would be made between Dec 1 – Jan 31, and with at least 30 days’ notice. If Microsoft or Red Hat chooses to increase the license fees that it charges for Windows or Red Hat Enterprise Linux, we may correspondingly increase the per-hour usage rate for previously purchased Reserved Instances with Windows or Red Hat Enterprise Linux. A clock-hour is defined as the standard 24-hour clock that runs from midnight to midnight, and is divided into 24 hours (for example, 1:00:00 to 1:59:59 is one clock-hour). You can run multiple instances concurrently, but can only receive the benefit of the Reserved Instance discount for a total of 3600 seconds per clock-hour instance usage that exceeds 3600 seconds in a clock-hour is billed at the On-Demand rate. A clock-hour is defined as the standard 24-hour clock that runs from midnight to midnight, and is divided into 24 hours (for example, 1:00:00 to 1:59:59 is one clock-hour).įor Linux instances, Reserved Instance billing benefits can apply to a maximum of 3600 seconds (one hour) of instance usage per clock-hour. An instance-hour begins when an instance is started and continues for 60 minutes or until the instance is stopped or terminated-whichever happens first. Previous Generation Reserved Instances are billed for instance usage during the entire Reserved Instance term.įor Windows instances, Reserved Instance billing benefits only apply to one instance-hour per clock-hour. If your needs change, you can also request to move your Reserved Instance to another Availability Zone within the same region, change its Network Platform, or, for Linux/UNIX Reserved Instancess, modify the instance size of your reservation to another size in the same instance type at no additional cost. In either case, the one-time fee per instance is non-refundable. Using the Reserved Instance Marketplace, you have the flexibility to purchase Reserved Instances from AWS Reserved Instance Marketplace sellers for terms ranging between 1 month to 36 months (depending on available selection). Previous Generation Reserved Instances can be purchased directly from AWS for one year or three-year terms. This takes the total cost of the Reserved Instance over the entire term, including any upfront payment, and spreads it out over each hour of the Reserved Instance term. ![]() The effective hourly price shows the amortized hourly instance cost. When you purchase a Reserved Instance, you are billed for every hour during the entire Reserved Instance term you select, regardless of whether the instance is running. ** Effective hourly pricing helps you calculate the amount of money a Reserved Instance will save you over On-Demand pricing. The hourly usage rate is equivalent to the total average monthly payments over the term of the Reserved Instance divided by the total number of hours (based on a 365 day year) over the term of the Reserved Instance. For each month, the actual monthly payment will equal the actual number of hours in that month multiplied by the hourly usage rate or number of seconds in that month multiplied by the hourly usage rate divided by 3600, depending on the EC2 instance type you run. *This is the average monthly payment over the course of the Reserved Instance term.
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