Amazon EC2 Reserved Instances and Other AWS Service Reservation Models
AWS Whitepaper

Measure Success

Making the most of reservations means measuring your reservation coverage (portion of instances enjoying reservation discount benefits) and reservation utilization (degree to which purchased Reserved Instances are used). Establish a standardized review cadence in which you answer the following questions:

  • Do we need to modify any of our existing reservations to increase utilization?

  • Are any currently utilized reservations expiring?

  • Do we need to purchase any reservations to increase our coverage?

A standardized review cadence ensures that issues are surfaced in a timely manner.