Question #760
An organization uses Amazon S3 to store confidential documents. After more than 18 months, the documents are moved to archival storage. The organization rarely accesses these documents but requires a storage solution that ensures maximum resiliency. The IT team must retrieve archived documents within 24 hours when needed.
Which solution meets these requirements MOST cost-effectively?
Use S3 Standard-Infrequent Access (S3 Standard-IA) to store the documents. Use S3 Glacier Deep Archive with standard retrieval to store and retrieve archived documents.
Use S3 Standard-Infrequent Access (S3 Standard-IA) to store the documents. Use S3 Glacier Deep Archive with bulk retrieval to store and retrieve archived documents.
Use S3 Intelligent-Tiering to store the documents. Use S3 Glacier Deep Archive with standard retrieval to store and retrieve archived documents.
Use S3 One Zone-Infrequent Access (S3 One Zone-IA) to store the documents. Use S3 Glacier Deep Archive with bulk retrieval to store and retrieve archived documents.
Explanation
Option A is correct because:
1. S3 Standard-IA stores data across multiple Availability Zones (AZs), ensuring maximum resiliency for the initial 18-month period.
2. S3 Glacier Deep Archive is the most cost-effective archival storage class. Its standard retrieval option delivers data within 12 hours, meeting the 24-hour retrieval requirement.
Other options are incorrect because:
- B/D: Bulk retrieval for Glacier Deep Archive takes up to 48 hours, exceeding the 24-hour requirement.
- C: S3 Intelligent-Tiering incurs additional monitoring costs and is unnecessary since the access pattern (18-month lifecycle) is predictable.
- D: S3 One Zone-IA uses a single AZ, reducing resiliency.
Key Points:
- Use Standard-IA/Intelligent-Tiering for infrequent access; prefer Standard-IA for predictable patterns.
- Glacier Deep Archive is ideal for archival with retrieval times ≤12 hours (standard) or ≤48 hours (bulk).
- Maximum resiliency requires multi-AZ storage (avoid One Zone-IA).
Answer
The correct answer is: A