SAA-C03 Question 185
Single answerA company operates a critical application on AWS. They require a disaster recovery (DR) solution that ensures minimal downtime and data loss in the event of a regional failure. The business has determined that the recovery time objective (RTO) must be less than 15 minutes and the recovery point objective (RPO) must be less than 5 minutes. Which DR strategy should they implement to meet these requirements?
- A
Backup and Restore
- B
Pilot Light
- C
Warm Standby
- D
Active-Active Failover
Show answer and explanation
Correct answer: D
Explanation
Active-Active Failover is the only strategy that can meet the strict RTO of less than 15 minutes and RPO of less than 5 minutes. By running fully operational instances in multiple regions, the solution ensures continuous availability and immediate failover with minimal data loss. Other strategies, like Backup and Restore, Pilot Light, and Warm Standby, are less costly but come with longer recovery times or higher potential data loss, making them unsuitable for this scenario.
- A. Incorrect.
Backup and Restore involves storing backups and restoring them during a disaster. While cost-effective, it cannot meet the stringent RTO of less than 15 minutes as restoration takes significant time.
- B. Incorrect.
Pilot Light involves running only a minimal infrastructure in a secondary region and scaling it up during a disaster. While it improves on Backup and Restore, it is unlikely to meet an RTO of less than 15 minutes due to the time needed for scaling.
- C. Incorrect.
Warm Standby maintains a scaled-down version of the application in the secondary region. Although it offers faster recovery than Pilot Light, it might still not meet the RTO and RPO requirements in this scenario.
- D. Correct.
Active-Active Failover involves running fully operational instances of the application in multiple regions. It can ensure near-instant failover (meeting the RTO) and minimal data loss (meeting the RPO), making it the best fit for the given requirements.