SOA-C03 practice question: EFS, FSx and shared storage

Monitoring, Logging, Analysis, Remediation, and Performance Optimization A free question from our original SOA-C03 practice exam. Try it, then open the answer to see why each option is right or wrong.

A public library stores scanned book pages on Amazon EFS, mounted by several EC2 instances that serve the online archive. Most pages are viewed a few times in the first month after scanning and then rarely, but any page must still open from the same file path when a reader requests it. The library wants to lower the storage bill with the LEAST operational effort. What should a CloudOps engineer do?

Choose one answer.

A. Set an EFS lifecycle policy to move files to Infrequent Access after 30 days and back to Standard on their first access.
B. Copy files older than 30 days to an S3 Glacier Flexible Retrieval bucket each month with AWS DataSync, then delete them from EFS.
C. Change the file system's throughput mode to Bursting so that the library pays only for throughput the archive actually uses.
D. Move the archive to Amazon FSx for Lustre linked to an S3 bucket, so that older files are released from the file system.

Show the answer and explanation

Answer: A

A. Right: Correct. EFS lifecycle management moves files between storage classes automatically while they keep the same path. Rarely read pages cost less, and a page that becomes popular moves back to Standard. Learn more: Managing storage lifecycle for Amazon EFS (opens in a new tab)
B. Wrong: This lowers storage cost, but the files would leave the EFS path and take hours to retrieve. It also adds a monthly job to run and monitor. Learn more: What is AWS DataSync? (opens in a new tab)
C. Wrong: Throughput mode affects how throughput is provided and billed, not the price of stored data. Most of this bill comes from storage that is rarely read. Learn more: Amazon EFS performance specifications (opens in a new tab)
D. Wrong: FSx for Lustre is built for high-performance computing workloads. Migrating to it adds work and does not fit a web archive better than EFS lifecycle management. Learn more: What is Amazon FSx for Lustre? (opens in a new tab)

Explanation

EFS has storage classes for files that are read rarely, and lifecycle management moves files into them after a chosen number of days without access. Files keep their paths, so applications need no change, and the policy can move a file back to Standard when it is read again. Copying data to S3 or another file system adds work and changes how files are accessed.

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Managing storage lifecycle for Amazon EFS

SOA-C03 practice question: EFS, FSx and shared storage

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