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In this article Overview of Data Transfer Costs for Common Architectures, the authors explain how data transfer charges works for Multi-Region direct connect.
Overview of Data Transfer Costs for Common Architectures
The article explains every data trasfer charges that may occur in each architecture.
One of the common architectures is Multi-Region Direct Connect (Figure 10 in the article), and the article does not mention cross-region transfer between the Direct Connect Associated Region and the Destination Region. The only chargers mentioned are for DTO, from the remote regions to outside of AWS.
I believe the right answer is: No, the data transfer from on-prem to a remote region (i.e., a different region from the one associated with Direct Connect) won't incur any data transfer charges.
Source: Overview of Data Transfer Costs for Common Architectures
Yes, there are data transfer charges involved when transferring data from your on-premises datacenter in Sao Paulo to an S3 bucket in the us-east-1 region using Direct Connect Gateway. Here's what you need to know:
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Direct Connect Gateway allows you to connect from your Direct Connect location in Sao Paulo to multiple AWS regions, including us-east-1.
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While there is no data transfer charge for data coming into AWS Direct Connect from your data center, there are charges for data transferred out of AWS via Direct Connect.
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In your case, since you're transferring data to a remote region (us-east-1) that's different from your Direct Connect location (Sao Paulo), you will incur cross-region data transfer charges.
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The AWS backbone network will be used to deliver your traffic from the Sao Paulo Direct Connect location to the us-east-1 region. This capability has technical benefits over using the internet to access remote AWS regions, but it comes with a cost.
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The cost for outbound data transfer varies by region and Direct Connect location. You'll need to check the specific pricing for transfers from Sao Paulo to us-east-1.
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It's important to note that these cross-region data transfer charges are typically lower than internet data transfer rates, making Direct Connect a more cost-effective option for large volume data transfers between geographically distant locations.
To optimize costs, consider the following:
- Monitor your data transfer using tools like AWS Cost Explorer or CloudWatch to understand and manage your usage.
- If possible, compress your data before transfer to reduce the overall volume.
- Consider if it's feasible to use the AWS region closest to your Direct Connect location to minimize cross-region transfer costs.
Remember to review the latest AWS pricing documentation for the most up-to-date and accurate cost information for your specific use case.
Sources
Cost - Hybrid Connectivity
Cost optimization pillar - Hybrid Networking Lens
COST08-BP02 Select components to optimize data transfer cost - AWS Well-Architected Framework
