AWS Certified Solutions Architect - Associate
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A company has a financial application that produces reports. The reports average 50 KB in size and are stored in Amazon S3. The reports are frequently accessed during the first week after production and must be stored for several years. The reports must be retrievable within 6 hours.
Which solution meets these requirements MOST cost-effectively?
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Community
UAnonymous
A
Use S3 Standard. Use an S3 Lifecycle rule to transition the reports to S3 Glacier after 7 days.
B
Use S3 Standard. Use an S3 Lifecycle rule to transition the reports to S3 Standard-Infrequent Access (S3 Standard-IA) after 7 days.
C
Use S3 Intelligent-Tiering. Configure S3 Intelligent-Tiering to transition the reports to S3 Standard-Infrequent Access (S3 Standard-IA) and S3 Glacier.
D
Use S3 Standard. Use an S3 Lifecycle rule to transition the reports to S3 Glacier Deep Archive after 7 days.
Explanation:
Explanation
Key Requirements Analysis:
- Frequent access during first week → Need Standard storage class initially
- Stored for several years → Long-term archival needed
- Retrievable within 6 hours → Glacier retrieval times (3-5 hours for Standard retrieval) meet this requirement
- Most cost-effective solution → Need to minimize storage costs for long-term archival
Option Analysis:
A. S3 Standard → S3 Glacier after 7 days
- ✅ Standard for first week (frequent access)
- ✅ Glacier for long-term storage
- ✅ Retrievable within 6 hours (Glacier Standard retrieval: 3-5 hours)
- ❌ Not the most cost-effective (Glacier Deep Archive is cheaper)
B. S3 Standard → S3 Standard-IA after 7 days
- ✅ Standard for first week
- ❌ Standard-IA is for infrequent access (minimum 30 days storage charge)
- ❌ Not suitable for "several years" storage (too expensive for long-term)
- ❌ Doesn't meet "most cost-effective" requirement
C. S3 Intelligent-Tiering
- ✅ Automatically moves objects between tiers
- ❌ Intelligent-Tiering doesn't transition to Glacier storage classes
- ❌ More expensive than direct lifecycle to Glacier Deep Archive
- ❌ Not the most cost-effective
D. S3 Standard → S3 Glacier Deep Archive after 7 days
- ✅ Standard for first week (frequent access)
- ✅ Glacier Deep Archive for long-term storage (cheapest option)
- ✅ Retrievable within 6 hours (Glacier Deep Archive Standard retrieval: 12 hours)
- ❌ WAIT: This doesn't meet the 6-hour retrieval requirement!
Critical Issue: The question states "retrievable within 6 hours" but Glacier Deep Archive Standard retrieval takes 12 hours. However, looking at the options:
- Glacier (Option A): 3-5 hours retrieval
- Glacier Deep Archive (Option D): 12 hours retrieval (doesn't meet 6-hour requirement)
Correction: Based on the retrieval requirement of "within 6 hours", Option A is actually correct because:
- Glacier retrieval times: Standard retrieval = 3-5 hours (meets 6-hour requirement)
- Glacier Deep Archive retrieval times: Standard retrieval = 12 hours (does NOT meet 6-hour requirement)
Therefore, the correct answer should be A.
Why A is the most cost-effective while meeting all requirements:
- First week: S3 Standard for frequent access
- After 7 days: Transition to S3 Glacier (cheaper than Standard-IA for long-term)
- Retrieval: Glacier Standard retrieval = 3-5 hours (meets 6-hour requirement)
- Cost: Glacier is significantly cheaper than Standard-IA for multi-year storage
Note: The question asks for "MOST cost-effective" solution that meets ALL requirements. While Glacier Deep Archive (Option D) is cheaper, it doesn't meet the 6-hour retrieval requirement. Therefore, Option A is the correct choice.
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