A media company is migrating its on-premises video processing infrastructure to AWS. The current infrastructure uses a custom application that splits video files into segments, transcodes them using FFmpeg, and assembles the final output. The application runs on a single server with 64 vCPUs and 256 GB RAM. The migration plan is to use AWS Batch with EC2 instances for the transcoding jobs. The video files are stored on an on-premises NAS and will be migrated to Amazon S3. The company needs to minimize latency for file access during migration and reduce the time to transfer initial data. The company has a 1 Gbps AWS Direct Connect connection. The total data volume is 500 TB. The migration window is 30 days. Which approach should the team use to transfer the initial data to S3 with the lowest latency and within the migration window?
Snowball Edge devices provide physical transport, overcoming bandwidth limitations and ensuring the transfer completes within 30 days.
Why this answer
Option B is correct because AWS Snowball Edge devices provide a physical, high-bandwidth transfer method that bypasses network constraints entirely. With 500 TB of data and a 1 Gbps Direct Connect link, the theoretical maximum transfer over the network in 30 days is only ~324 TB (1 Gbps * 30 days * 86400 seconds/day / 8 bits per byte), which is insufficient. Multiple Snowball Edge devices in parallel can transfer the full 500 TB within the migration window without saturating the Direct Connect link, and the Snowball client efficiently copies data to S3 after the devices are returned.
Exam trap
The trap here is that candidates underestimate the bandwidth limitation of a 1 Gbps Direct Connect link over a 30-day window, assuming it can handle 500 TB, while failing to calculate the actual throughput (max ~324 TB) and ignoring that network overhead and contention further reduce effective transfer rates.
How to eliminate wrong answers
Option A is wrong because AWS DataSync over a 1 Gbps Direct Connect connection cannot transfer 500 TB within 30 days; the maximum achievable throughput is ~324 TB, and real-world overhead (protocol, retransmissions) reduces this further, making it impossible to meet the deadline. Option C is wrong because a single AWS Snowball Edge device has a usable storage capacity of up to 80 TB, which is insufficient for 500 TB, and incremental copying would require multiple shipments, exceeding the 30-day window. Option D is wrong because S3 Transfer Acceleration uses internet-based transfers over public endpoints, which would be slower and less reliable than Direct Connect, and it does not address the fundamental bandwidth limitation of 1 Gbps.