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Difficulty: EasyResilient and Highly Available Storage Infrastructure

A digital marketing agency runs a media processing application on Amazon EC2 instances distributed across multiple Availability Zones in the us-east-1 Region. The application requires a shared file storage solution that offers at least 99.99%99.99\% availability and high durability for active assets. Additionally, the architecture must support a Recovery Time Objective (RTO) of near-zero minutes and a Recovery Point Objective (RPO) of 00 for all active editing sessions. The storage must allow simultaneous read and write access from all EC2 instances across the Availability Zones. Which storage solution should a solutions architect recommend to meet these requirements?

  1. Configure an Amazon EFS file system using the Standard storage class to mount across all EC2 instances.Answer
  2. B
    Provision an Amazon EBS Provisioned IOPS SSD (io2) volume with Multi-Attach enabled to mount on all EC2 instances.
  3. C
    Store the active media assets in an Amazon S3 Glacier Flexible Retrieval vault and configure the application to perform standard retrievals.
  4. D
    Set up a pilot light environment in a secondary Region, replicating files from a primary Amazon EBS volume using scheduled cron jobs.

Answer

Configure an Amazon EFS file system using the Standard storage class to mount across all EC2 instances.
Amazon EFS is a fully managed, shared file system designed to be highly resilient and available across multiple Availability Zones. The Standard storage class replicates data across multiple AZs in a Region, ensuring high durability, 99.99%99.99\% availability, and immediate, concurrent read/write access. This fulfills the near-zero RTO and RPO requirements for active media editing sessions.

Step-by-Step Solution

1
Identify the storage access requirements for the application.
The application requires shared file storage that allows simultaneous read/write access from multiple EC2 instances distributed across different Availability Zones.
This rules out standard Amazon EBS volumes, which are restricted to a single Availability Zone and do not support multi-instance mounting across AZ boundaries.
2
Evaluate the recovery objectives (RTO and RPO) and availability targets.
The solution must deliver at least 99.99%99.99\% availability, a near-zero RTO, and an RPO of 00.
Amazon EFS Standard synchronously replicates data across multiple Availability Zones, ensuring high resilience, instant failover, and zero data loss in the event of an AZ disruption.
3
Select the correct service class and eliminate sub-optimal storage classes.
Amazon EFS Standard is selected, as archive solutions like Amazon S3 Glacier introduce retrieval latency that violates the near-zero RTO.
EFS Standard satisfies all constraints of shared access, high durability, high availability, and instant availability of data.

Key Concept

Amazon EFS provides highly available, multi-AZ elastic file storage that supports concurrent read/write operations from multiple EC2 instances, meeting strict recovery objectives (RTO/RPO) for shared active file systems.
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Resilient and Highly Available Storage Infrastructure

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