Which solution will meet these requirements with the MOST operational efficiency?
Use Amazon S3 File Gateway. Integrate S3 File Gateway with the on-premises applications to store and directly retrieve files by using the SMB file system.
Use an AWS Storage Gateway Volume Gateway with cached volumes as iSCSI targets.
Use an AWS Storage Gateway Volume Gateway with stored volumes as iSCSI targets.
Use an AWS Storage Gateway Tape Gateway. Integrate Tape Gateway with the on-premises applications to store virtual tapes in Amazon S3.
Explanations:
Amazon S3 File Gateway is designed for file-based access to S3, using the SMB protocol. While it provides low-latency access to frequently accessed data, it may not fully meet the low-latency requirements for applications expecting block storage performance.
AWS Storage Gateway Volume Gateway with cached volumes allows frequently accessed data to be stored in low-latency local cache, while the rest resides in AWS. This provides low-latency access to data while efficiently utilizing cloud storage for less frequently accessed data.
AWS Storage Gateway Volume Gateway with stored volumes requires all data to be stored in the cloud, which could lead to increased latency for frequently accessed data, contradicting the requirement for low-latency access.
AWS Storage Gateway Tape Gateway is meant for backup and archiving solutions, not for frequently accessed data. It stores data as virtual tapes in Amazon S3, which is not suitable for applications needing low-latency access to data.
As I understand it, the answer is:
Use an AWS Storage Gateway Volume Gateway with cached volumes as iSCSI targets.