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Difficulty: HardAWS Storage Services

A research institution is deploying an analytics application on AWS. The application requires two distinct storage solutions:

1. A shared, POSIX-compliant file system that can be accessed concurrently by a fleet of over 100 Amazon EC2 instances.
2. A high-performance, persistent block storage volume attached to a single EC2 instance for a transactional database.

Which two AWS storage services should the organization choose to meet these requirements? (Select two.)

  1. Amazon Elastic File System (Amazon EFS) to provide the shared file systemAnswer
  2. Amazon Elastic Block Store (Amazon EBS) to provide the persistent block storage for the databaseAnswer
  3. C
    Amazon Simple Storage Service (Amazon S3) to provide the shared, POSIX-compliant file system
  4. D
    Amazon EC2 Instance Store to provide the persistent block storage for the database
  5. E
    Amazon S3 Glacier Flexible Retrieval to provide the low-latency block storage for the database

Answer

Amazon Elastic File System (Amazon EFS) should be selected for the concurrent, POSIX-compliant shared file system, and Amazon Elastic Block Store (Amazon EBS) should be selected to provide persistent block storage for the transactional database.
The system requires a shared file system accessible by many instances simultaneously, which matches Amazon Elastic File System (Amazon EFS). It also requires persistent block storage for a single database instance, which matches Amazon Elastic Block Store (Amazon EBS).

Step-by-Step Solution

1
Analyze the first requirement: a shared, POSIX-compliant file system that supports concurrent access from multiple (100+) EC2 instances.
Identify Amazon Elastic File System (Amazon EFS) as the correct choice since it is a fully managed network file system (NFS) designed for multi-instance concurrent access.
Amazon EFS is natively POSIX-compliant and supports simultaneous mounts from multiple EC2 instances, whereas EBS is typically limited to single-instance attachment at this scale and S3 is object storage rather than a native file system.
2
Analyze the second requirement: persistent block storage attached to a single EC2 instance for a transactional database.
Identify Amazon Elastic Block Store (Amazon EBS) as the correct choice since it offers persistent block-level storage volumes for a single instance.
Amazon EC2 Instance Store is temporary (ephemeral) storage and does not persist data when the instance is stopped, making it unsuitable for a persistent database. S3 Glacier is for archival storage and does not support block-level access or low-latency database workloads.

Key Concept

Selecting appropriate AWS storage services based on access pattern (object vs. file vs. block) and persistence requirements.

Alternative Method

For database storage, while Amazon RDS is a managed database service that could be used, the scenario specifies attaching a storage volume to a single self-managed EC2 instance, which restricts the choice to EC2-compatible block storage (EBS).
Estimated Time:2m 0s
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Topics

AWS Storage Services

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