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Domain 4.3: Design migrationsDomain 4MigrationsAzure Data BoxOffline Transfer

AZ-305 · Question 50 · Domain 4.3: Design migrations

A media production company needs to migrate 150 TB of historical video archives from their on-premises SAN to Azure Blob Storage.

The company's datacenter has a 100 Mbps internet connection. This connection is heavily utilized by daily operations, and only 20 Mbps can be dedicated to the migration effort.

You need to recommend a migration strategy that completes the transfer as quickly as possible without impacting daily operations.

What should you recommend?

Answer options:

A.

Use AzCopy over the internet with bandwidth throttling enabled.

B.

Configure Azure ExpressRoute and use Azure Data Factory.

C.

Order an Azure Data Box, copy the data locally, and ship it to Microsoft.

D.

Use Azure File Sync to tier the data to Azure over time.

How to approach this question

Calculate the math: 150 TB over 20 Mbps takes years. Offline transfer is the only viable solution.

Full Answer

C.Order an Azure Data Box, copy the data locally, and ship it to Microsoft.✓ Correct
This is a classic 'offline vs online' migration decision. Transferring 150 TB over a 20 Mbps connection would take approximately 700 days (nearly 2 years). When network bandwidth is a bottleneck, offline data transfer is the architectural standard. Azure Data Box is a ruggedized appliance shipped to your datacenter. You copy data to it at local LAN speeds (e.g., 10 Gbps), ship it back to Microsoft, and they upload it directly to your storage account in the Azure datacenter.

Common mistakes

Suggesting ExpressRoute. While it solves the bandwidth issue, it is an expensive, permanent networking solution that is overkill for a one-time data transfer.
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