A disaster-recovery switch must be able to launch EC2 instances in a specific Availability Zone.
Capacity availability matters more than a long-term discount.
Which option is appropriate?
On-Demand Capacity Reservations reserve matching EC2 capacity in a specified Availability Zone; capacity and discounts are separate concerns.
Detailed explanation
They reserve matching EC2 capacity in a specified Availability Zone.
They reserve matching EC2 capacity in a specified Availability Zone.
Budgets monitors cost or usage and does not reserve EC2 launch capacity.
Budgets monitors cost or usage and does not reserve EC2 launch capacity.
Cost Explorer analyzes cost and usage; it does not reserve capacity.
Cost Explorer analyzes cost and usage; it does not reserve capacity.
This optimizes S3 storage tiers and is unrelated to EC2 capacity.
This optimizes S3 storage tiers and is unrelated to EC2 capacity.
Check official documentation
Compare the following points with the official documentation.
EC2 On-Demand Capacity Reservationsの容量確保と課金の公式説明を確認する。
Official references
What to confirm
容量確保と料金割引を別の要件として説明できる。
Key points
- Capacity Reservation
- Availability Zone
- Capacity assurance
Notes
- Environment:
- Pricing and conditions can change. Check the current AWS pricing page for the service and Region before implementation.
Foundation review
Capacity and discount
Capacity Reservations address availability; Savings Plans and RIs primarily address pricing.
Matching attributes
The instance configuration must match reservation attributes to use the capacity.