Which is the MOST cost-efficient and scalable deployment that will resolve the issues for users?
Reconfigure Amazon EFS to enable maximum I/O.
Update the blog site to use instance store volumes for storage. Copy the site contents to the volumes at launch and to Amazon S3 at shutdown.
Configure an Amazon CloudFront distribution. Point the distribution to an S3 bucket, and migrate the videos from EFS to Amazon S3.
Set up an Amazon CloudFront distribution for all site contents, and point the distribution at the ALB.
Explanations:
While enabling maximum I/O on EFS may improve performance, it does not address the root cause of buffering and timeout issues related to high traffic.
Using instance store volumes does not provide durability and scalability. The complexity of copying data on launch and shutdown is not cost-efficient.
Using Amazon CloudFront to distribute videos from S3 reduces latency and offloads traffic from the web application, providing a scalable and cost-efficient solution.
Pointing CloudFront at the ALB may help with some caching, but it does not specifically address the video content optimization, which is crucial for resolving buffering issues.
I systematize that the answer is:
Configure an Amazon CloudFront distribution. Point the distribution to an S3 bucket, and migrate the videos from EFS to Amazon S3.