12-06 RI Limits

Last updated Aug 17, 2023 Edit Source

There is a limit to the number of Reserved Instances that you can purchase per month.

Per month you can purchase

• 20 Regional Reserved Instances per Region
• 20 Zonal Reserved Instances per AZ

• You cannot exceed your running On-Demand Instance limit by purchasing regional Reserved Instances. The default On-Demand Instance limit is 20.
• Before purchasing RI ensure your On-Demand limit is equal to or greater than your RI you intend to purchase

• You can exceed your running On-Demand Instance limit by purchasing zonal Reserved Instances
• If you already have 20 running On-Demand Instances, and you purchase 20 zonal Reserved Instances, you can launch a further 20 On-Demand Instances that match the specifications of your zonal Reserved Instances