TierFS

A POSIX filesystem with a multi-tier cache over S3-compatible storage, solving the problem of slow and repetitive data access in distributed environments. It targets developers, ops, and IT teams in companies of all sizes, particularly those running AI workloads, training clusters, or agent platforms. It is positioned as an open-source tool that provides a unified mount across environments, with local NVMe caching for sub-millisecond reads and no proprietary lock-in.

Key features

• Multi-tier cache (local, peer, tier)
• Sub-millisecond cached reads
• Mount on laptop, sandbox, or cluster
• Native file format, no proprietary chunks
• Pluggable backends (S3, MinIO, etc.)
• POSIX subset filesystem
• Supports Linux and macOS
• Open source, written in Rust