AWS Certified Solutions Architect - Associate
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A company has several on-premises Internet Small Computer Systems Interface (iSCSI) network storage servers. The company wants to reduce the number of these servers by moving to the AWS Cloud. A solutions architect must provide low-latency access to frequently used data and reduce the dependency on on-premises servers with a minimal number of infrastructure changes.
Which solution will meet these requirements?
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A
Deploy an Amazon S3 File Gateway.
B
Deploy Amazon Elastic Block Store (Amazon EBS) storage with backups to Amazon S3.
C
Deploy an AWS Storage Gateway volume gateway that is configured with stored volumes.
D
Deploy an AWS Storage Gateway volume gateway that is configured with cached volumes.
Explanation:
Explanation
This question is about migrating iSCSI storage servers to AWS while maintaining low-latency access to frequently used data with minimal infrastructure changes.
Let's analyze each option:
A. Deploy an Amazon S3 File Gateway.
- This is incorrect because S3 File Gateway provides file-based access (NFS/SMB) to Amazon S3, not block storage access.
- iSCSI is a block storage protocol, so this wouldn't be compatible with existing iSCSI applications.
B. Deploy Amazon Elastic Block Store (Amazon EBS) storage with backups to Amazon S3.
- This is incorrect because EBS is a cloud-native block storage service that requires applications to be migrated to AWS.
- This would require significant infrastructure changes, not "minimal number of infrastructure changes."
C. Deploy an AWS Storage Gateway volume gateway that is configured with stored volumes.
- This is incorrect for this specific requirement.
- Stored volumes keep the entire dataset locally and asynchronously back up to AWS.
- This doesn't reduce on-premises storage dependency significantly since all data is still stored locally.
D. Deploy an AWS Storage Gateway volume gateway that is configured with cached volumes.
- CORRECT ANSWER
- Cached volumes store only frequently accessed data locally while keeping the entire dataset in Amazon S3.
- This provides low-latency access to frequently used data (cached locally).
- Reduces dependency on on-premises servers by moving the primary data store to AWS.
- Requires minimal infrastructure changes - just deploy the Storage Gateway appliance.
- Maintains iSCSI compatibility for existing applications.
Key AWS Services:
- AWS Storage Gateway: Hybrid cloud storage service that connects on-premises environments with AWS cloud storage.
- Volume Gateway: Provides iSCSI block storage access to cloud storage.
- Cached Volumes: Store primary data in Amazon S3, cache frequently accessed data locally.
- Stored Volumes: Store primary data locally, asynchronously back up to AWS.
Why this meets the requirements:
- Low-latency access to frequently used data: Frequently accessed data is cached locally.
- Reduce dependency on on-premises servers: Primary data storage moves to Amazon S3.
- Minimal infrastructure changes: Just deploy the Storage Gateway appliance; existing iSCSI applications continue to work unchanged.
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