An application runs on Amazon EC2 Linux instances across multiple Availability Zones and needs a storage layer that is highly available, POSIX-compliant, maximally durable, shareable across instances, and frequently accessed for the first 30 days then infrequently thereafter. Which solution meets these requirements MOST cost-effectively?
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Correct answer: Use the Amazon Elastic File System (Amazon EFS) Standard storage class. Create a lifecycle management policy to move infrequently accessed data to EFS Standard-Infrequent Access (EFS Standard-IA)..
Why this is the answer
The application requires a POSIX-compliant, shareable file system across multiple Availability Zones, which EFS provides. EFS Standard storage offers high availability and durability across multiple AZs. The requirement for data to be frequently accessed for 30 days and then infrequently thereafter is perfectly met by EFS Lifecycle Management, which automatically transitions data from EFS Standard to EFS Standard-Infrequent Access (EFS Standard-IA) for cost savings. S3 is an object storage service, not POSIX-compliant, and cannot be mounted directly as a file system by EC2 instances. EFS One Zone is not suitable as the application runs across multiple Availability Zones.
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