Question 22
Domain 4: Accelerate Workload Migration and ModernizationA global ecommerce company has many data centers around the world. With the growth of its stored data, the company needs to set up a solution to provide scalable storage for legacy on-premises file applications. The company must be able to take point-in-time copies of volumes by using AWS Backup and must retain low-latency access to frequently accessed data. The company also needs to have storage volumes that can be mounted as Internet Small Computer System Interface (iSCSI) devices from the company ' s on-premises application servers. Which solution will meet these requirements?
Correct answer: C
Explanation
AWS Storage Gateway volume gateway in cache mode keeps "frequently accessed data" on-premises for "low-latency access" while storing the full dataset in AWS for scalable capacity. It also presents storage as iSCSI volumes and supports point-in-time backups through AWS Backup, which matches the requirement to "take point-in-time copies of volumes."
Why each option is right or wrong
A. Provision an AWS Storage Gateway tape gateway. Configure the tape gateway to store data in anAmazon S3 bucket. Deploy AWS Backup to take point-in-time copies of the volumes.
Tape Gateway emulates virtual tape libraries for backup workflows, not iSCSI application volumes.
B. Provision an Amazon FSx File Gateway and an Amazon S3 File Gateway. Deploy AWS Backup to take point-in-time copies of the data.
File gateways expose file shares, not block volumes mounted as iSCSI devices.
C. Provision an AWS Storage Gateway volume gateway in cache mode. Back up the on-premises Storage Gateway volumes with AWS Backup.
AWS Storage Gateway Volume Gateway in cached mode is the only option that satisfies all three constraints at once: it exposes storage to on-premises servers as iSCSI volumes, keeps the most recently accessed data locally for low-latency reads, and stores the full volume data in AWS for scalable capacity. Under the AWS Backup integration for Storage Gateway volumes, point-in-time backups are supported for these volumes, which is why this architecture fits the requirement for volume snapshots without sacrificing on-premises application access.
D. Provision an AWS Storage Gateway file gateway in cache mode. Deploy AWS Backup to take point-in-time copies of the volumes.
File Gateway provides file-based access protocols, not volume snapshots of iSCSI-mounted block storage.