Modern FS Benchmark review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Modern FS Benchmark is an open-source Linux benchmark suite for comparing copy-on-write and classic filesystem stacks. It is designed for engineers evaluating btrfs, ZFS, bcachefs, ext4, and XFS across single-device, redundant, encrypted, compressed, snapshot, degraded, and near-full configurations. Alongside sequential and random read/write tests, it covers directory operations, fsync behavior, reflinks, rebuilds, corruption recovery, and ENOSPC behavior. Its command-line workflow and Linux focus make it a fit for advanced filesystem evaluation rather than casual disk checks.

Its strongest distinction is breadth of filesystem scenarios. The suite can compare redundancy layouts, age and scale snapshots, measure compression, inject corruption, run scrubs, and evaluate recovery. It also includes degraded-operation and rebuild tests, which extend evaluation beyond ordinary throughput or IOPS measurements. Fsync and other tail-latency measurements add detail for workloads where average performance does not tell the whole story. This makes the product useful when the question is how a filesystem behaves under changing capacity, protection, or failure conditions—not simply how fast a disk reads and writes.

For repeatable engineering workflows, Modern FS Benchmark supports GitHub Actions, NixOS, deploy-rs, and fio, with execution locally, in CI, or on dedicated hardware. JSON result output and published dashboard charts support repeated comparisons and reporting. The trade-off is a Linux-only scope and a specialized focus that assumes familiarity with filesystem layouts, storage configurations, and benchmark interpretation. Choose it for serious Linux filesystem comparison, CI-based regression tracking, and recovery-oriented testing; choose a simpler disk benchmark when basic sequential, random, or latency measurements are all you need.

Modern FS Benchmark pros and cons

• Where it wins
  • Tests redundancy, snapshots, compression, rebuilds, and recovery
  • Measures random and sequential I/O, IOPS, latency, and tail behavior
  • Runs in GitHub Actions or on real hardware with JSON and dashboards
• Where it doesn't
  • Linux-only platform support
  • Requires filesystem and hardware benchmarking expertise
  • Focused on filesystem evaluation rather than general disk testing

Modern FS Benchmark fact sheet, pricing and score →

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Last updated 7 Oct 2026 · How we research and update