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Difficulty: HardDesigning Infrastructure for Business Requirements and Cost Optimization

A digital media archiving enterprise needs to migrate 1.8 PB1.8\text{ PB} of historical video assets from an on-premises storage area network (SAN) to Cloud Storage Coldline for compliance retention. The company's on-premises site has a single 100 Mbps100\text{ Mbps} dedicated internet uplink, which is consistently utilized at 70%70\% capacity by core daily business operations. The project timeline strictly requires completing the full data transfer within 30 days30\text{ days} while minimizing overall transfer costs and preventing any impact on existing operational network traffic. Which data transfer strategy should the cloud architect recommend?

  1. Order Google Cloud Transfer Appliance devices, copy the data locally on-premises, ship the encrypted appliances to Google for ingestion into Cloud Storage, and configure Object Lifecycle Management rules.Answer
  2. B
    Deploy Storage Transfer Service agents on-premises to stream the dataset over the internet uplink during off-peak night hours using parallel multi-thread execution.
  3. C
    Configure an High Availability (HA) VPN gateway using multiple IPsec tunnels to aggregate bandwidth and stream the data directly into Cloud Storage.
  4. D
    Provision a 10 Gbps Dedicated Interconnect connection backed by a 3-year Committed Use Discount (CUD) to stream the data to Google Cloud via Private Google Access.

Answer

Order Google Cloud Transfer Appliance devices to perform an offline migration, ship them to Google for ingestion into Cloud Storage Coldline, and enforce lifecycle rules.
Transferring 1.8 PB1.8\text{ PB} over a constrained 100 Mbps100\text{ Mbps} link (with only 30 Mbps30\text{ Mbps} available capacity) would take over 15 years to complete online. Utilizing Google Cloud Transfer Appliance allows the enterprise to securely copy data locally at multi-gigabit speeds on-premises and ship the physical hardware to Google for rapid ingestion into Cloud Storage Coldline within the 30-day requirement, while avoiding long-term network infrastructure expenditure and preventing operational network degradation.

Step-by-Step Solution

1
Calculate available online bandwidth and required transfer duration for the dataset.
Remaining network capacity is 30% of 100 Mbps=30 Mbps30\% \text{ of } 100\text{ Mbps} = 30\text{ Mbps}. Uploading 1.8 PB1.8\text{ PB} (1.44×1016 bits1.44 \times 10^{16}\text{ bits}) at 30 Mbps30\text{ Mbps} requires approximately 1.44×101630×106=4.8×108 seconds≈5,555 days\frac{1.44 \times 10^{16}}{30 \times 10^6} = 4.8 \times 10^8\text{ seconds} \approx 5,555\text{ days}, far exceeding the 30 day30\text{ day} limit.
Online transfer strategies over the existing link cannot meet the time constraint.
2
Evaluate offline vs online high-speed dedicated connection alternatives for cost and timing.
Provisioning a Dedicated Interconnect circuit incurs high setup fees and requires long provisioning lead times often exceeding 30 days. Transfer Appliance enables rapid local rack-and-copy deployment without long-term commitments.
Offline hardware appliance ingestion eliminates network bottlenecking and long-term financial commitments for one-time migrations.
3
Select the optimal product for cost and business requirement alignment.
Transfer Appliance handles petabyte-scale offline moves securely within days while avoiding network saturation and unnecessary long-term interconnect commitments.
Meets RTO/timeline requirements with lowest total cost of ownership.

Key Concept

Selecting Data Transfer Strategies based on Bandwidth, Dataset Size, and Cost
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Topics

Designing Infrastructure for Business Requirements and Cost Optimization