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Difficulty: MediumLarge-Scale Data Transfer using Snow Family, DataSync, and Transfer Family

An enterprise is migrating 180 TB180\text{ TB} of historical records from an on-premises HDFS cluster to Amazon S3. The migration must be completed within a strict 14-day window. The enterprise has a 1 Gbps1\text{ Gbps} AWS Direct Connect connection, with a maximum of 400 Mbps400\text{ Mbps} allocated for migration traffic. Concurrently, the enterprise needs to replace a legacy on-premises SFTP server used by external partners to upload daily reports directly to their storage backend. Which combination of actions should the solutions architect take to meet these requirements? (Select TWO.)

  1. Order multiple AWS Snowball Edge Storage Optimized devices, configure them with an HDFS client, load the historical data, and ship them back to AWS for import into Amazon S3.Answer
  2. B
    Configure AWS DataSync with on-premises agents to transfer the 180 TB180\text{ TB} of historical HDFS data directly to the Amazon S3 buckets over the Direct Connect link.
  3. Deploy an AWS Transfer Family SFTP endpoint backed by Amazon S3, and map the partner identities to IAM roles that access the S3 buckets.Answer
  4. D
    Encrypt the imported S3 buckets using the default AWS managed key (aws/s3) and configure a cross-account IAM role to allow external partner accounts to modify the key policy.
  5. E
    Configure a Transit Gateway with Direct Connect Gateway to enable transitive VPC-to-VPC routing for the external partner SFTP traffic to target private EC2 instances hosting SFTP daemons.

Answer

Order multiple AWS Snowball Edge Storage Optimized devices to physically migrate the historical HDFS data to Amazon S3, and deploy an AWS Transfer Family SFTP endpoint backed by Amazon S3 for external partner daily file ingestion.
The correct options recommend ordering physical AWS Snowball Edge Storage Optimized devices for the offline transfer and deploying AWS Transfer Family for partner ingestion. Because the network calculation indicates that a 180 TB180\text{ TB} transfer over 400 Mbps400\text{ Mbps} requires more than 41 days, online transit using DataSync violates the 14-day requirement. Therefore, offline shipping via Snowball is required. To replace the legacy SFTP server natively and serverlessly, AWS Transfer Family backed by Amazon S3 is the optimal choice.

Step-by-Step Solution

1
Calculate the transfer time for migrating the 180 TB180\text{ TB} dataset over the available network bandwidth.
The available bandwidth is 400 Mbps400\text{ Mbps}. Converting the dataset size yields 180 TB=1.44×1015 bits180\text{ TB} = 1.44 \times 10^{15}\text{ bits}. The time required is 1.44×1015/(400×106 bps)=3,600,000 seconds≈41.7 days1.44 \times 10^{15} / (400 \times 10^6\text{ bps}) = 3,600,000\text{ seconds} \approx 41.7\text{ days}.
To determine whether online network migration (using AWS DataSync) can satisfy the 14-day migration window.
2
Identify the appropriate migration method based on the time constraints.
Since 41.7 days41.7\text{ days} exceeds the 14-day limit, an offline data transfer method is required. AWS Snowball Edge Storage Optimized devices can physically transport the data to AWS within a few days.
To satisfy the migration window requirements by avoiding slow network transit.
3
Select a solution for the external partner SFTP ingestion workflow.
AWS Transfer Family manages SFTP protocols natively and stores the uploaded objects directly in Amazon S3, replacing the legacy SFTP server without managing virtual machine infrastructure.
To transition partner integration to a scalable, serverless managed service.

Key Concept

Selecting the optimal data transfer mechanisms (Snowball Edge vs. DataSync) based on network constraint calculations, and integrating serverless file transfer protocols (AWS Transfer Family) for external ingestion.
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Topics

Large-Scale Data Transfer using Snow Family, DataSync, and Transfer Family

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