AWS Certified Solutions Architect - Associate
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A company will migrate 10 PB of data to Amazon S3 in 6 weeks. The current data center has a 500 Mbps uplink to the internet. Other on-premises applications share the uplink. The company can use 80% of the internet bandwidth for this one-time migration task.
Which solution will meet these requirements?
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UAnonymous
A
Configure AWS DataSync to migrate the data to Amazon S3 and to automatically verify the data.
B
Use rsync to transfer the data directly to Amazon S3.
C
Use the AWS CLI and multiple copy processes to send the data directly to Amazon S3.
D
Order multiple AWS Snowball devices. Copy the data to the devices. Send the devices to AWS to copy the data to Amazon S3.
Explanation:
Explanation
Data Calculation:
- 10 PB = 10,000 TB = 10,000,000 GB
- Available bandwidth: 500 Mbps × 80% = 400 Mbps
- 400 Mbps = 50 MB/s (since 8 bits = 1 byte)
- Time required via internet: 10,000,000 GB ÷ 50 MB/s = 200,000,000 seconds ≈ 2,315 days ≈ 6.3 years
Analysis:
- Option A (AWS DataSync): Uses internet transfer, would take ~6.3 years - doesn't meet 6-week requirement
- Option B (rsync): Uses internet transfer, would take ~6.3 years - doesn't meet 6-week requirement
- Option C (AWS CLI with multiple processes): Still limited by internet bandwidth, would take ~6.3 years - doesn't meet 6-week requirement
- Option D (AWS Snowball): Uses physical data transfer devices, bypasses internet bandwidth limitations. Multiple Snowball devices can transfer 10 PB in parallel within 6 weeks
Why Snowball is correct:
- Bandwidth limitation: 400 Mbps is insufficient for 10 PB in 6 weeks
- Snowball capacity: Each Snowball device can hold 80 TB (Snowball Edge) or 210 TB (Snowmobile for larger migrations)
- Parallel transfer: Multiple devices can be used simultaneously
- Time calculation: With Snowball, transfer time is limited only by local network speed to devices, not internet bandwidth
- AWS handles upload: Once devices are shipped to AWS, AWS handles the data transfer to S3
Key AWS Service Knowledge:
- AWS Snowball: Physical data transport solution for large-scale data migrations
- Use cases: When network bandwidth is insufficient, data transfer would take too long over internet, or security/compliance requirements
- Alternatives: AWS Direct Connect could help but still limited by 500 Mbps uplink
Best Practice: For data migrations >1 PB or when transfer time over internet exceeds planned migration window, use Snowball family services.
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