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Hi,
assuming that you use S3 sync (or cp) to download, there are some parameters that you can change at this level (depending on your requirements and data structure) to improve throughput and to better use the available h/w: see https://repost.aws/knowledge-center/s3-improve-transfer-sync-command
In particular, the section "Modifying the AWS CLI configuration value for max_concurrent_requests" is relevant even if you don't copy from S3 to S3.
Also, a deep read of https://repost.aws/knowledge-center/s3-optimize-transfer will help
Best,
Didier
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Adding additional NICs will not get you additional bandwidth on EC2. Each instance is rated for the max bandwidth through the one default NIC. Adding NICs in additional subnets gets to more IPs/interfaces for things like firewalling/routing.
I think it's not true according to the doc of aws m6in.32xlarge:
The for p4d, they have 4 network cards actually. Each NIC can be added to different device. So does the magic happened inside hardware layer? Like one NIC can fully utilize 4 physical network cards?