A company plans to deploy a business-critical application in AWS that requires durable storage with consistent, low-latency performance. Which storage type should the solutions architect recommend?
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Correct answer: Provisioned IOPS SSD Amazon Elastic Block Store (Amazon EBS) volume.
Why this is the answer
Provisioned IOPS SSD (io1/io2 Block Express) Amazon EBS volumes are designed for business-critical applications requiring sustained, consistent, and low-latency performance with high IOPS. They are ideal for transactional workloads like databases. Instance store volumes provide temporary block-level storage for an EC2 instance. While they offer high performance, the data is lost when the instance stops or terminates, making them unsuitable for durable storage. Amazon ElastiCache for Memcached is an in-memory caching service, not a durable primary storage solution for application data. Throughput Optimized HDD (st1) Amazon EBS volumes are designed for frequently accessed, throughput-intensive workloads like big data and data warehouses, not for the low-latency, high-IOPS requirements of business-critical transactional applications.
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