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

Reservation Management Techniques

You can manage reservations either by using a central IT operations or management team or by using a specific team or business unit. The following table summarizes the different reservation management techniques.

Central Reservation Management Team/Business Unit Reservation Management
Maximizes reservation coverage by covering aggregate usage across a business Increases likelihood of high reservation utilization (e.g., using already-purchased reservations), because a single team should understand its capacity commitment of RIs
Simplifies overall reservation management especially when combining central management and Convertible Reserved Instances Reduces interfacing or planning between the business unit and the central team
Reduces the requirement for an individual team to understand reservations Streamlines decisions about purchases, purchase process, and reservation account location