Foxing aspires to be an eBPF-powered replication engine for Linux filesystems
14 hours ago
- #ebpf
- #rust
- #filesystem-replication
- Foxing is an eBPF-powered replication engine for Linux filesystems (XFS, Btrfs, F2FS, Ext4), offering near real-time mirroring with robust consistency guarantees.
- It consists of two components: fxcp (a standalone smart copy tool that auto-adapts with CoW/reflink, io_uring, and BLAKE3 Merkle delta detection) and foxingd (an eBPF daemon for continuous, event-driven mirroring with sub-millisecond latency).
- Key features include adaptive copy strategies (e.g., NFS compound RPC, FICLONE, sendfile, io_uring), snapshot management with FXAR v2 archives for deduplication, and safety mechanisms like loop prevention, mount monitoring, and hydration cleanup.
- Performance benchmarks show fxcp outperforming rsync in many scenarios, with foxingd achieving 15-21ms latency for single-file replication.
- Configuration is via TOML for foxingd, while fxcp requires no configuration and auto-detects storage stacks.
- Safety features include ENOSPC safe stall, partial write protection, and consistency guarantees with fsync barriers.
- Monitoring is available through Prometheus metrics, and extensive testing includes an adversarial test suite for reliability.