cunoFS – mount S3/AZ/GCP storage *without* FUSE, 60x faster than s3fs
Hello HN! We’re Dan and Vaughan, based in Cambridge, UK. We recently launched cunoFS, a filesystem for fast, POSIX object storage access. Yes, we’ve heard that “Object Storage is just not suitable for POSIX workloads” or that “workloads should be rewritten to natively support S3”. But what if it could be? And often much faster than S3-native apps? We’ve worked hard to make this possible, without the shortcomings of other approaches. Summary here: - Run (unmodified) applications with S3/AZ/GCP or “S3 compatible” storage, for example: ls s3:// az://…
cunoFS – mount S3/AZ/GCP storage *without* FUSE, 60x faster than s3fs launched on March 8, 2024 with 19 votes, #1,160 of 4,270 launches that month and more than 75% of that year's launches. The site was not reachable when checked in September 2026.
In plain words
cunoFS is a filesystem that enables unmodified applications to access S3, Azure, or GCP object storage using standard POSIX commands and operations. Built by Dan and Vaughan, it mounts cloud storage without requiring FUSE and claims to be significantly faster than existing S3 filesystem solutions. The tool supports common operations like ls, rsync, and file I/O across multiple cloud providers, making it suitable for developers and organizations who want to run existing applications against object storage without rewriting them for cloud-native APIs.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hello HN! We’re Dan and Vaughan, based in Cambridge, UK. We recently launched cunoFS, a filesystem for fast, POSIX object storage access. Yes, we’ve heard that “Object Storage is just not suitable for POSIX workloads” or that “workloads should be rewritten to natively support S3”. But what if it could be? And often…
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