Last Week in AWS (Blog)

S3 Is Not a Filesystem (But Now There’s One In Front of It)

AWS launched S3 Files, a managed service that lets you mount an S3 bucket as an NFS 4.1/4.2 filesystem on EC2, Lambda, EKS, and ECS. The service builds a thin POSIX layer on top of EFS, automatically syncing files to S3 while charging only for the hot slice of data accessed. Pricing mirrors EFS performance‑optimized rates ($0.30/GB‑month storage, $0.03/GB reads, $0.06/GB writes) plus standard S3 costs for untouched objects. Users must model I/O patterns because every operation has a 32 KB minimum charge.