ECR or EFS cost for Lambda

Question

I am building a lambda function that needs to use 1.2GB of data file, and am considering two possibilities:

1. build a <50MB lambda function without the data file, put the data file into an EFS and attached it to the lambda, or
2. pack everything into an ECR image

while Lambda's pricing page says that data transfer with EFS and ECR are free, it does also mention it could incur costs in other services.
EFS (Elastic throughput) has a read access cost of about $0.03, and ECR has a data transfer out cost of about $0.09 per GB.
are these costs going to be incurred when i read them from a Lambda?

Answer

Hi,

For EFS pricing, as mentioned [here](https://aws.amazon.com/efs/pricing/) that "You pay for read and write access using Elastic Throughput" this price for read write access activity not for data transfer.

For ECR pricing, as mentioned [here](https://aws.amazon.com/ecr/pricing/) "Amazon Elastic Container Service (Amazon ECS) on Amazon EC2 or AWS Fargate to pull 1 TB per month of images within the same region so they are not charged for data transfer out"

For data transfer charges, it depends on many dimensions e.g. AZ, Region, Serverless etc. I suggest you to check the blogs below to understand how it may apply to your use-case.

https://aws.amazon.com/blogs/apn/aws-data-transfer-charges-for-server-and-serverless-architectures/
https://aws.amazon.com/blogs/architecture/overview-of-data-transfer-costs-for-common-architectures/

Thanks

ECR or EFS cost for Lambda

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