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Difficulty: MediumDesigning Migration Plans and Data Transfer Strategies

An enterprise needs to migrate 800 TB of historical archive files from an on-premises data center to Google Cloud Storage. The company operates a dedicated 100 Mbps internet link, of which only 30 Mbps can be safely allocated to migration traffic without degrading existing operations. Company policy mandates that the data transfer must be completed within 30 days. Which data transfer strategy should the cloud architect recommend?

  1. Order a Google Cloud Transfer Appliance, copy the archive data onto the device locally, and ship it to Google for direct ingestion into Cloud Storage.Answer
  2. B
    Configure Storage Transfer Service to upload the archive files directly over the available 30 Mbps internet bandwidth.
  3. C
    Establish an HA VPN tunnel over the internet connection and stream the files using multi-threaded upload utilities.
  4. D
    Provision a Dedicated Interconnect link to stream the files directly into a multi-region Cloud Spanner instance.

Answer

Order a Google Cloud Transfer Appliance, copy the archive data onto the device locally, and ship it to Google for direct ingestion into Cloud Storage.
The decision between online network transfer and offline physical appliance migration is governed by total data volume, available network bandwidth, and acceptable migration time. Transferring 800 TB over an available 30 Mbps link requires more than 6.7 years. Using Google Cloud Transfer Appliance allows high-speed local data ingest onto encrypted hardware, which is physically shipped to Google for rapid upload into Cloud Storage within days.

Step-by-Step Solution

1
Calculate required transfer throughput
To move 800 TB (800×1012800 \times 10^{12} bytes) in 30 days (2.592×1062.592 \times 10^6 seconds), a sustained transfer rate of approximately 2.47 Gbps2.47\text{ Gbps} (308.6 MB/s308.6\text{ MB/s}) is required.
Determines whether an online transfer over the existing WAN connection is feasible within the target timeline.
2
Compare required throughput against available bandwidth
The available network bandwidth is 30 Mbps (0.03 Gbps0.03\text{ Gbps}), which yields only ∼324 GB/day\sim 324\text{ GB/day}, requiring over 2,460 days for complete migration.
Evaluates network bandwidth limitations against business timeline constraints.
3
Select the appropriate GCP transfer mechanism
Choosing an offline physical transfer method using Google Cloud Transfer Appliance bypasses WAN bandwidth bottlenecks and fulfills the 30-day window.
Transfer Appliance provides high-capacity hardware for secure offline data transport when network bandwidth is inadequate.

Key Concept

Selecting Online vs. Offline Data Transfer Strategies based on Dataset Size and Network Bandwidth
Estimated Time:2m 0s
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Topics

Designing Migration Plans and Data Transfer Strategies