# OpenZFS

22 Hacker News commenters recommended OpenZFS and 5 criticized it, November 2025 to November 2026. It was recommended in 9 of 13 months. It meets the Hacker Approved badge rule.

**Verdict:** Recommended for reliable storage pools and safe migration between systems; main caveat is the external kernel module, which needs checking after kernel updates.

## Why people recommend it

- Stable and reliable storage (3 comments): "it has continually proven to be one of, if not the most reliable filesystem on the planet" ([source](https://news.ycombinator.com/item?id=48600497)) "has been pretty stable as a kernel module for quite awhile" ([source](https://news.ycombinator.com/item?id=48053095)) "I strongly recommend ZFS for daily-driver use." ([source](https://news.ycombinator.com/item?id=49663841))
- Works on FreeBSD and Linux (4 comments): "The code bases adhere (modulo ZFS version numbers) to a spec and you can safely migrate the pools between OS." ([source](https://news.ycombinator.com/item?id=48828249)) "I personally found it easier to just run Samba on plain FreeBSD/OpenZFS" ([source](https://news.ycombinator.com/item?id=47581490)) "I hand-built FreeBSD, OpenZFS, Bastille, and Samba how I want it" ([source](https://news.ycombinator.com/item?id=45821853))
- Expandable pools and usable capacity (2 comments): "turning existing storage into significantly more usable capacity" ([source](https://news.ycombinator.com/item?id=47951772)) "OpenZFS released the zpool expansion as stable last year." ([source](https://news.ycombinator.com/item?id=48594669))
- Encrypted root-on-ZFS setups (2 comments): "Openzfs and ZFSBootMenu has been my personal single greatest additions to linux." ([source](https://news.ycombinator.com/item?id=47848288)) "I have OpenZFS-native encrypted root-on-ZFS for Kubuntu 25.10" ([source](https://news.ycombinator.com/item?id=47407937))

## What people warn about

- Kernel module needs version checks (2 comments): "Still sucks that you need to verify if your kernel update is compatible with the external module." ([source](https://news.ycombinator.com/item?id=48602083)) "the zfs module only works with certain kernel versions" ([source](https://news.ycombinator.com/item?id=45910665))

## Alternatives hackers recommend

- [mergerfs](https://hackerapproved.com/p/mergerfs.md): 6 recommend

## Cite as

Hacker Approved, "OpenZFS", https://hackerapproved.com/p/openzfs/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).