Amazon EC2 Auto Scaling now supports reservations-then-balanced Availability Zone distribution
Amazon EC2 Auto Scaling offers a new strategy that prioritizes launching instances into capacity reservations before evenly distributing remaining capacity across Availability Zones, maximizing utilization of pre-purchased capacity.
Amazon EC2 Auto Scaling now offers reservations-then-balanced, a new Availability Zone distribution strategy that prioritizes launching instances into capacity reservations before distributing remaining capacity evenly across Availability Zones. This enables you to maximize utilization of pre-purchased capacity such as On-Demand Capacity Reservations, Capacity Blocks, and Interruptible Capacity Reservations, while retaining the operational simplicity and resilience of Auto Scaling. You can configure reservations-then-balanced by setting the capacity distribution strategy in the AvailabilityZoneDistribution configuration of your Auto Scaling group and targeting reservations by Capacity Reservation Group ARN or by individual Capacity Reservation IDs. There is no additional charge to use reservations-then-balanced; you continue to pay standard EC2 pricing for your reservations and any On-Demand or Spot instances launched by the group. Reservations-then-balanced is available today in all AWS commercial Regions.