GCP Professional Cloud Architect Practice Question

Your media company needs to migrate 500 TB of video archives from a NAS in its U.S. data center to a Cloud Storage bucket within four weeks. The site has a steady 1 Gbps connection that must remain available for day-to-day operations, but about 5 TB of new footage is produced every day and should arrive in Google Cloud without interruption. Which data-transfer approach best meets the deadline while keeping operational effort low?

Create an online transfer job with Storage Transfer Service to copy the entire 500 TB and daily changes over the 1 Gbps link.
Run parallel gsutil -m cp commands from multiple on-premises servers to upload both the archive and daily changes directly to Cloud Storage.
Order a 2-rack 1 PB Transfer Appliance and repeatedly copy both the historical archive and subsequent daily footage to it until the migration is complete.
Ship one or more Transfer Appliance devices for the initial 500 TB bulk copy, then schedule an ongoing Storage Transfer Service agent job over the existing link to move the 5 TB of daily changes.

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Answer Description

A 1 Gbps link can move at most about 10 TB per day under ideal conditions, so transferring 500 TB online would take well over a month and would also consume most of the available bandwidth. Using Transfer Appliance offloads the one-time bulk upload; after the appliance is shipped back and ingested by Google, only the 5 TB of daily deltas remain. Storage Transfer Service with an on-premises agent can move these incremental changes over the existing link using bandwidth scheduling and retries, without manual scripting. Continuously recopying to a shipped appliance is impossible, and large gsutil jobs would suffer the same bandwidth and operational limits as an all-online transfer. Therefore, combining Transfer Appliance for the initial load with Storage Transfer Service for ongoing online transfers is the optimal solution.

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