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Cloud Computing · Advanced

On-Demand Capacity Reservation (ODCR)

AWS feature that reserves EC2 capacity in a specific AZ for any duration, without a term commitment.

Definition

On-Demand Capacity Reservations guarantee that capacity for a specific instance type is available in an AZ when needed, billed at On-Demand rates whether or not instances run. They can be combined with Savings Plans or regional RIs for discounts.

Example

A company reserves 50 m6i.large instances in one AZ ahead of a planned failover test.

Exam tip

Savings Plans and regional RIs do not guarantee capacity; Capacity Reservations (or zonal RIs) do.

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