No. 12 of 29 ·Disk Benchmark Software

Modern FS Benchmark

Linux · Self-hosted

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Freedom report

One barScore 5.4

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Modern FS Benchmark is ranked #12 of 29 in disk benchmark software on Freedom251. It runs on Linux, Self-hosted.

Compared on disk benchmark software

Free plan: Yes
Random I/O tests: Yes
Sequential tests: Yes
IOPS measurement: Yes
Latency measurement: Yes
Supported platforms: Linux
Command-line interface: Yes

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The record

Purpose: Modern FS Benchmark continuously benchmarks multi-device copy-on-write filesystems, including btrfs, ZFS, and bcachefs, against ext4 and XFS baselines.
Workloads: Its benchmark phases measure throughput, latency, snapshots, compression, reflinks, degraded operation and rebuild, corruption recovery, and near-full behavior.
Results dashboard: Results are published in a dashboard with per-metric charts, aging curves, run trends, filters, and a sortable table.
CI cadence: GitHub Actions runs benchmarks on every push and on a six-hour schedule using four loop devices backed by sparse files.
CI limitation: Hosted CI devices share one virtual disk, so the project says absolute throughput is meaningless and RAID striping gains are fictional in those runs.
Hardware runs: The scripts can run against real block devices, which are wiped when listed for a benchmark run; devices must be unmounted and existing filesystem signatures require BENCH_WIPE=1.
Linux deployment: The repository provides a Nix flake with a reusable NixOS module and benchmark package for dedicated self-hosted GitHub Actions runners.
Security scope: The corruption test overwrites a raw range on one device, scrubs, and checks one tracked file hash; it is not a whole-filesystem health check.
Integrity coverage: The project describes checksum verification and reconstruction testing for btrfs, ZFS, and bcachefs when redundancy is configured.
Methodology limits: The exact workload recipes and composite summary index are project-specific rather than an industry-standard benchmark.
Licensing: Source code, configuration, workflows, and documentation use Apache License 2.0, while published benchmark datasets use CC BY 4.0.
Support: The maintainer invites issues and pull requests for workload, configuration, methodology, and filesystem suggestions.
Sponsor support: The maintainer says a suitable dedicated server costs approximately €70 per month and accepts financial support through GitHub Sponsors and Ko-fi.
Maintainer: The repository copyright identifies Bartosz Fenski; it does not state a headquarters or founding date.

Where it ranks on Freedom251

Best Disk Benchmark Software in 2026#12 of 29

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Sources

github.com/fenio/modern-fs-benchmark· checked 4 Oct 2026