How can I find out if my Amazon EC2 Reserved Instance provides regional benefit or size flexibility?

Last updated: 2021-01-15

I want to purchase an Amazon Elastic Compute Cloud (Amazon EC2) Reserved Instance (RI) that provides the regional benefit or that's size-flexible.

Resolution

All Amazon EC2 RIs that are size-flexible also provide the regional benefit, but the reverse is not always true.

For an RI to provide the regional benefit, the following must be true:

  • It must be a Standard or Convertible RI.
  • It must be in the active state.
  • It must not be tied to a specific Availability Zone.

For an RI to be size-flexible:

  • It must meet the regional benefit criteria.
  • It must have a platform value of Linux/UNIX.
  • It must not be a G4 instance.
  • It must not have a dedicated tenancy.
  • It must not be tied to a specific Availability Zone.

An RI that provides the regional benefit applies to any instance in that Region that matches the specifications of the RI.

An RI that's size-flexible applies all or part of its pricing benefit to any instance in the same instance family, regardless of Availability Zone or size.

For example, an RI that's size-flexible for a c4.large instance applies to either a c4.large instance or two c4.medium instances. In the same way, two c4.medium instances can also be applied to usage for a c4.large instance.