What is the MOST operationally efficient way to replicate the images?
Configure a periodic process to run the aws s3 sync command from the on-premises file system to Amazon S3. Configure an AWS Lambda function to process event notifications from Amazon S3 and copy the images from Amazon S3 to the EFS file system.
Deploy an AWS Storage Gateway file gateway with an NFS mount point. Mount the file gateway file system on the on-premises server. Configure a process to periodically copy the images to the mount point.
Deploy an AWS DataSync agent to an on-premises server that has access to the NFS file system. Send data over the Direct Connect connection to an S3 bucket by using a public VIF. Configure an AWS Lambda function to process event notifications from Amazon S3 and copy the images from Amazon S3 to the EFS file system.
Deploy an AWS DataSync agent to an on-premises server that has access to the NFS file system. Send data over the Direct Connect connection to an AWS PrivateLink interface VPC endpoint for Amazon EFS by using a private VIF. Configure a DataSync scheduled task to send the images to the EFS file system every 24 hours.
Explanations:
While this option utilizes S3 for intermediate storage, it introduces additional complexity with AWS Lambda and event notifications, making it less efficient for direct replication to EFS. The process of syncing to S3 and then copying to EFS is not as streamlined as using DataSync.
Using a Storage Gateway with an NFS mount point can work, but it involves setting up a gateway, which adds overhead. It does not utilize the Direct Connect connection effectively for transferring data directly to EFS.
This option uses DataSync but involves an unnecessary step of syncing to S3 first, which complicates the process and could introduce latency and additional costs. The AWS Lambda function adds further complexity.
Deploying an AWS DataSync agent directly to the on-premises server allows for efficient data transfer over the Direct Connect connection. It sends data directly to the EFS file system using a private VIF, optimizing performance and operational efficiency with a scheduled task for regular replication.
I compute that the answer is:
Deploy an AWS DataSync agent to an on-premises server that has access to the NFS file system. Send data over the Direct Connect connection to an AWS PrivateLink interface VPC endpoint for Amazon EFS by using a private VIF. Configure a DataSync scheduled task to send the images to the EFS file system every 24 hours.