AWS Certified Solutions Architect - Associate
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A rapidly growing ecommerce company is running its workloads in a single AWS Region. A solutions architect must create a disaster recovery (DR) strategy that includes a different AWS Region. The company wants its database to be up to date in the DR Region with the least possible latency. The remaining infrastructure in the DR Region needs to run at reduced capacity and must be able to scale up if necessary.
Which solution will meet these requirements with the LOWEST recovery time objective (RTO)?
Other
Community
UAnonymous
A
Use an Amazon Aurora global database with a pilot light deployment.
B
Use an Amazon Aurora global database with a warm standby deployment.
C
Use an Amazon RDS Multi-AZ DB instance with a pilot light deployment.
D
Use an Amazon RDS Multi-AZ DB instance with a warm standby deployment.
Explanation:
Explanation
Correct Answer: B - Use an Amazon Aurora global database with a warm standby deployment.
Key Requirements Analysis:
- Database up to date in DR Region with least possible latency - Aurora Global Database provides cross-region replication with typically less than 1 second latency
- Remaining infrastructure in DR Region needs to run at reduced capacity - Warm standby deployment has minimal infrastructure running
- Must be able to scale up if necessary - Warm standby can scale up when needed
- Lowest RTO (Recovery Time Objective) - Warm standby provides faster recovery than pilot light
Why Option B is Correct:
- Amazon Aurora Global Database provides cross-region replication with low latency (typically <1 second), meeting the requirement for up-to-date database in DR Region
- Warm Standby deployment has minimal infrastructure running in DR Region (reduced capacity) that can be scaled up quickly when needed
- Warm standby has lower RTO than pilot light because some infrastructure is already running and can be scaled up faster
Why Other Options are Incorrect:
- A (Aurora Global Database with pilot light): Pilot light has higher RTO than warm standby because it requires more time to scale up from minimal infrastructure
- C (RDS Multi-AZ with pilot light): RDS Multi-AZ is within a single region, not cross-region, so doesn't meet the DR requirement for a different AWS Region
- D (RDS Multi-AZ with warm standby): Same issue as C - RDS Multi-AZ is single-region only, not suitable for cross-region DR
Key Concepts:
- Amazon Aurora Global Database: Cross-region replication with low latency
- Warm Standby: Minimal infrastructure running in DR region, can scale up quickly
- Pilot Light: Only core services running, requires more time to scale up
- RTO (Recovery Time Objective): Time to recover after a disaster - warm standby has lower RTO than pilot light
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