# trapexit/mergerfs

a featureful union filesystem

Repository: https://github.com/trapexit/mergerfs
Canonical: https://ross.abutalabs.com/products/mergerfs
Homepage: http://trapexit.github.io/mergerfs/
Language: C++
License: NOASSERTION
License Family: other
Topics: mergerfs, fuse, unionfs, aufs, plex, subsonic, kodi, xattr, mhddfs, filesystem, jbod, overlayfs, libfuse, datahoarding, jellyfin, jbofs
Last push: 2026-08-14T22:28:05+00:00

## Health v2 (maintenance only)
Score: 88/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 71, longevity 100
- inputs: {"age_days": 4545, "days_push": 19, "days_rel": 117, "gap_med": 88.5, "n_releases_24m": 3}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5823, forks 223 (observed 2026-08-28T04:09:30.095943+00:00)

## What it is
mergerfs is a FUSE-based union filesystem that logically merges multiple filesystem paths into a single mount point. It offers configurable file placement policies, hard link support, xattrs, and POSIX ACLs for managing storage across many commodity drives.

## Use cases
- merge multiple hard drives into one mount point
- pool JBOD disks without RAID
- combine filesystems for a Plex or Jellyfin media library
- add or remove drives from a pooled storage volume
- present a single directory view over scattered data paths

## When to choose
- you want to pool disks of different sizes and filesystem types without RAID
- you need runtime-configurable file placement policies
- you want near-native IO passthrough performance
- you run a home media server on heterogeneous storage

## When to avoid
- you need redundancy or parity protection (use SnapRAID or RAID)
- you need read/write overlay with whiteouts like OverlayFS
- you need files split/striped across devices
- you are on a non-Linux platform without FUSE support

## Facets
- artifact type: application
- maturity: active
- function: file-system, cli
- domain: files, self-hosted, developer-tools
- platform: cpp, cli
- tags: fuse, union-filesystem, storage, datahoarding, jbod, media-server, xattr, acl, linux

## Member repositories
- trapexit/mergerfs (main) score 88

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:30.095943+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:52:10.545349+00:00, confidence not recorded.
  - readme: https://github.com/trapexit/mergerfs (fetched 2026-08-28T04:09:30.095943+00:00, sha cec8d7de3433)
  - homepage: http://trapexit.github.io/mergerfs/ (fetched 2026-08-29T08:47:34.745338+00:00, sha 36c6c3c2e4f9)
- Data as of 2026-08-30T08:39:29.467469+00:00.