AWS Certified Solutions Architect Associate SAA-C03 Practice Question
Your client's application experiences unpredictable and intermittent periods of intense read and write operations, driven by seasonal events. The application's data storage must be cost-effective, handle sudden increases in demand, and automatically revert to a cost-saving state during off-peak times without manual intervention. Which AWS service should be used for the primary storage of application data to meet these requirements?
Amazon Elastic File System (EFS) with Lifecycle Management policies
Amazon S3 One Zone-Infrequent Access (S3 One Zone-IA)
Amazon S3 Intelligent-Tiering is the only S3 storage class that monitors object-level access patterns and automatically moves data between frequent-access, infrequent-access, and archive tiers. This keeps objects in the lowest-cost tier that still delivers millisecond access when demand suddenly rises, with no performance penalty and no retrieval fees.
S3 Standard-IA and S3 One Zone-IA have lower per-GB storage prices than S3 Standard, but they charge per-GB retrieval fees and do not change tier automatically, so spikes in access can drive up costs.
Amazon EFS provides fully elastic file-system storage and (through EFS Lifecycle Management and EFS Intelligent-Tiering) can also move files between Standard and IA/Archive classes. However, EFS is a POSIX-compliant network file system that typically costs more per-GB than S3 object storage and is most appropriate when the workload needs shared file semantics. For object-based application data with unpredictable access, S3 Intelligent-Tiering is usually the most cost-effective choice.
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