AZ-305 Question 218
Single answerA company has 70 TB of unstructured data in its on-premises data center. Network bandwidth is limited, and the deadline for completing the migration to Azure Blob Storage is very tight. Which Azure migration approach should you recommend to minimize the transfer time and reduce reliance on the slow network connection?
- A
Use Azure Files to manually copy the data via the slow network connection
- B
Use Azure Data Box to ship storage devices and upload data offline
- C
Use AzCopy over an existing site-to-site VPN connection
- D
Use an ExpressRoute circuit to directly connect on-premises to Azure
Show answer and explanation
Correct answer: B
Explanation
Azure Data Box provides a reliable offline migration method for large amounts of data, particularly when network bandwidth is limited. By physically shipping data on secure storage devices to Microsoft's datacenters, you can avoid long transfer times over slow links. This aligns with Microsoft’s recommended approach for bulk data migration under tight deadlines. More details can be found in the official Azure Data Box documentation: https://learn.microsoft.com/azure/databox/
- A. Incorrect.
Option 1: Azure Files provides a managed file share in Azure. However, copying large amounts of data (70 TB) over a limited connection would be time-consuming, so this is not the best approach for an expedited, large-scale migration.
- B. Correct.
Option 2: Azure Data Box is designed for large-scale, offline data transfers. You can order physical devices, copy your data to them locally, and ship them to an Azure data center, which is faster when network bandwidth is constrained. This is the correct solution.
- C. Incorrect.
Option 3: AzCopy is a command-line tool for transferring data to Azure Storage. While it’s efficient for smaller or incremental transfers, 70 TB over a slow link could take an impractically long time, making it unsuitable for tight deadlines.
- D. Incorrect.
Option 4: ExpressRoute provides a dedicated private connection, but it requires setup time and costs, and it may not fully solve the time constraint if the underlying bandwidth remains limited. It’s not the optimal choice for an immediate bulk migration given the urgency.