Which solution will meet these requirements with the LEAST operational overhead?
Create an Amazon Elastic File System (Amazon EFS) volume that uses EFS Intelligent-Tiering. Use AWS DataSync to migrate the data to the EFS volume.
Create an Amazon FSx for ONTAP instance. Create an FSx for ONTAP file system with a root volume that uses the auto tiering policy. Migrate the data to the FSx for ONTAP volume.
Create an Amazon S3 bucket that uses S3 Intelligent-Tiering. Migrate the data to the S3 bucket by using an AWS Storage Gateway Amazon S3 File Gateway.
Create an Amazon FSx for OpenZFS file system. Migrate the data to the new volume.
Explanations:
Amazon EFS with EFS Intelligent-Tiering is suited for NFS, not for SMB protocol access, which is required by Windows clients. This makes it incompatible with the mixed-protocol requirements of the solution.
Amazon FSx for ONTAP supports both SMB and NFS protocols and includes an auto-tiering feature, enabling seamless data access for frequently and infrequently accessed data with minimal operational overhead.
Amazon S3 with S3 Intelligent-Tiering via AWS Storage Gateway does not natively support SMB or NFS access for EC2 instances, creating compatibility issues with direct access for Windows, Mac, and Linux clients.
Amazon FSx for OpenZFS is optimized for NFS but does not support SMB, making it unsuitable for mixed client environments that include Windows instances requiring SMB protocol access.
I have a feeling that the answer is:
Create an Amazon FSx for ONTAP instance. Create an FSx for ONTAP file system with a root volume that uses the auto tiering policy. Migrate the data to the FSx for ONTAP volume.