SAA-C03 · Question #447
A company hosts an application on AWS that stores files that users need to access. The application uses two Amazon EC2 instances. One instance is in Availability Zone A, and the second instance is…
The correct answer is C. Mount an Amazon Elastic File System (Amazon EFS) file system to the EC2 instances. Copy the. Amazon EFS provides a fully managed, highly available, and shared file system that can be mounted by instances across multiple Availability Zones. This ensures consistency of files between EC2 instances and avoids replication issues. EBS volumes, in contrast, are AZ-scoped and…
Question
A company hosts an application on AWS that stores files that users need to access. The application uses two Amazon EC2 instances. One instance is in Availability Zone A, and the second instance is in Availability Zone B. Both instances use Amazon Elastic Block Store (Amazon EBS) volumes. Users must be able to access the files at any time without delay. Users report that the two instances occasionally contain different versions of the same file. Users occasionally receive HTTP 404 errors when they try to download files. The company must address the customer issues. The company cannot make changes to the application code. Which solution will meet these requirements in the MOST operationally efficient way?
Options
- ARun the robocopy command on one of the EC2 instances on a schedule to copy files from the
- BConfigure the application to store the files on both EBS volumes each time a user writes or
- CMount an Amazon Elastic File System (Amazon EFS) file system to the EC2 instances. Copy the
- DCreate an EC2 instance profile that allows the instance in Availability Zone A to access the S3
How the community answered
(39 responses)- A3% (1)
- B5% (2)
- C79% (31)
- D13% (5)
Explanation
Amazon EFS provides a fully managed, highly available, and shared file system that can be mounted by instances across multiple Availability Zones. This ensures consistency of files between EC2 instances and avoids replication issues. EBS volumes, in contrast, are AZ-scoped and not designed for multi-instance sharing. Options A and B rely on custom replication or manual file handling, which increases operational overhead and risks inconsistencies. Option D does not solve the shared access and consistency requirement. By migrating storage to EFS, both EC2 instances will read and write to the same storage system, ensuring that users always access the latest files without 404 errors.
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