This is pretty simple. Time to transfer using Transfer Appliance: 1-3 weeks (I've used it twice and had a 2-3 week turnaround total) Time to transfer using 1Gbps : 30 hours (https://cloud.google.com/architecture/migration-to-google-cloud-transferring-your-large-datasets) Answer is D, using gsutil

No perfect answer as B and D both have flaws. B is time latency as transfer appliance usually takes weeks; D gsutil applies for less than 1TB. The answer should be storage transfer service for on-premises data, which is not available here. If have to choose one I go for B

Option B (Data Transfer appliance) is the best choice for efficient and cost-effective data migration while minimizing database load and transfer time. This solution bypasses network limitations and reduces the impact on the on-premises environment, making it ideal for migrating large data sets to the cloud.

Compressing the data and uploading it with gsutil -m can be a good optimization for your transfer, but it has limitations to consider: Compression Overhead: While compressing the data can reduce upload size and potentially speed up transfer, the compression and decompression processes themselves take time and resources. Depending on your data type, the benefit of reduced size might be offset by the processing overhead. Transfer Appliance: The recommended approach with the Transfer Appliance already utilizes parallel transfers for faster uploads, potentially making gsutil -m less impactful. I will go with B

Compressing the data and uploading it with gsutil -m can be a good optimization for your transfer, but it has limitations to consider: Compression Overhead: While compressing the data can reduce upload size and potentially speed up transfer, the compression and decompression processes themselves take time and resources. Depending on your data type, the benefit of reduced size might be offset by the processing overhead. Transfer Appliance: The recommended approach with the Transfer Appliance already utilizes parallel transfers for faster uploads, potentially making gsutil -m less impactful. I will go with B

with 1 Gbps it will take only 30 hrs so best option is D

Option B and D are most feasible options Option B will be okay if the size of the data is too huge Option D will be good for a few TBs of data. I am assuming 10 TB will fit in this case. https://cloud.google.com/blog/topics/developers-practitioners/how-transfer-your-data-google-cloud

Answer B. Cp limit is 5 TB max

I chose D. According to the link below, 10TB of data can be transferred in 30h. The light blue area is the acceptable line for online transfer. https://cloud.google.com/architecture/migration-to-google-cloud-transferring-your-large-datasets?hl=ja#online_versus_offline_transfer

https://cloud.google.com/architecture/migration-to-google-cloud-transferring-your-large-datasets

https://cloud.google.com/architecture/migration-to-google-cloud-transferring-your-large-datasets#online_versus_offline_transfer

It is B

it is D. it is far more faster to send this 10TB data over network, than 'call' for Transfer Applience.

Transfer Appliance: 1-3 weeks Transfer using 1Gbps : 30 hours

Is Transfer Appliance suitable for me? Transfer Appliance is a good fit for your data transfer needs if: You are an existing Google Cloud customer. Your data resides in locations that Transfer Appliance is available. It would take more than one week to upload your data over the network. vs Time to transfer using 1Gbps : 30 hours

I just want to ask who choose B. Both B and D you can find some evidence in the doc. So we do not talk about the doc, we just talk about if 30 hours to transfer it you can not accept it, and if you use transfer appliance it will spend over 10 days you can accept? So forget about the doc, if google want you to choose B, they will give you 100TB or 1PB rather than 10TB

Option B is correct. Below is the explanation. Transfer scenario Recommendation Transferring from another cloud storage provider Use Storage Transfer Service. Transferring less than 1 TB from on-premises Use gcloud storage. Transferring more than 1 TB from on-premises Use Storage Transfer Service. Transferring less than 1 TB from another Cloud Storage region Use gcloud storage. Transferring more than 1 TB from another Cloud Storage region Use Storage Transfer Service.