DOP-C02 Question 195
Single answerYour company runs a critical e-commerce application on AWS. The application must be highly available, and any downtime should be minimal. You have been tasked with designing a disaster recovery (DR) strategy that balances cost and recovery time objectives (RTO). Which disaster recovery strategy would you choose to ensure the environment is partially running and can scale in case of a disaster?
- A
Backup and Restore
- B
Pilot Light
- C
Warm Standby
- D
Multi-Region Active-Active
Show answer and explanation
Correct answer: B
Explanation
Pilot Light is the best choice for this scenario as it strikes a good balance between cost and recovery time objectives. It ensures that the critical components of the application are always running, enabling rapid scaling to restore full functionality during a disaster. This makes it suitable for applications where downtime must be minimal without incurring the high costs of fully operational secondary environments.
- A. Incorrect.
Backup and Restore is the most cost-effective strategy but has a high recovery time objective (RTO) since the entire environment must be restored from backups, making it unsuitable for minimal downtime requirements.
- B. Correct.
Pilot Light is a cost-effective DR strategy that keeps critical system components (such as databases) running at all times, enabling rapid scaling of other components to restore full functionality in the event of a disaster. This aligns well with the requirement to minimize downtime while controlling costs.
- C. Incorrect.
Warm Standby is a more expensive solution that keeps a scaled-down version of the fully-functioning environment running, making it faster than Pilot Light but less cost-effective. While this could work, it is not as balanced in terms of cost and RTO as Pilot Light in this scenario.
- D. Incorrect.
Multi-Region Active-Active involves running fully operational environments in multiple regions simultaneously, which ensures maximum availability and immediate failover. However, it is the most expensive option and does not align with the requirement to balance cost with RTO.