AWS Certified Solutions Architect - Associate
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A company needs to migrate a legacy application from an on-premises data center to the AWS Cloud because of hardware capacity constraints. The application runs 24 hours a day, 7 days a week. The application's database storage continues to grow over time.
What should a solutions architect do to meet these requirements MOST cost-effectively?
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UAnonymous
A
Migrate the application layer to Amazon EC2 Spot Instances. Migrate the data storage layer to Amazon S3.
B
Migrate the application layer to Amazon EC2 Reserved Instances. Migrate the data storage layer to Amazon RDS On-Demand Instances.
C
Migrate the application layer to Amazon EC2 Reserved Instances. Migrate the data storage layer to Amazon Aurora Reserved Instances.
D
Migrate the application layer to Amazon EC2 On-Demand Instances. Migrate the data storage layer to Amazon RDS Reserved Instances.
Explanation:
Explanation
Correct Answer: C
Why Option C is correct:
- Application layer (EC2 Reserved Instances): Since the application runs 24/7, using Reserved Instances provides the most cost-effective option compared to On-Demand pricing. Reserved Instances offer significant discounts (up to 72%) for steady-state workloads with predictable usage patterns.
- Database layer (Amazon Aurora Reserved Instances): Aurora is a MySQL and PostgreSQL-compatible relational database that offers better performance and cost-effectiveness than standard RDS. Using Reserved Instances for Aurora provides the same cost benefits as EC2 Reserved Instances for the database tier.
- Growing storage: Aurora automatically scales storage up to 128 TiB, which addresses the requirement that "database storage continues to grow over time."
Why other options are incorrect:
Option A:
- EC2 Spot Instances are not suitable for 24/7 applications as they can be interrupted with short notice
- Amazon S3 is object storage, not suitable for a relational database workload
Option B:
- EC2 Reserved Instances are correct for the application layer
- RDS On-Demand Instances are more expensive than Reserved Instances for 24/7 workloads
Option D:
- EC2 On-Demand Instances are more expensive than Reserved Instances for continuous workloads
- RDS Reserved Instances are correct for the database layer, but Aurora Reserved Instances would be more cost-effective and scalable
Key AWS Concepts:
- Reserved Instances: Provide significant cost savings (up to 72%) for predictable workloads
- Amazon Aurora: MySQL/PostgreSQL-compatible database with better performance, scalability, and cost-effectiveness than standard RDS
- Cost optimization: For 24/7 workloads, Reserved Instances are always more cost-effective than On-Demand or Spot Instances
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