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Welcome to OpenZFS

OpenZFS brings together developers and users from various open-source forks of the original ZFS on different platforms and we're always looking to grow our community. There are a multitude of ways to contribute to the project and contributors are happy to help newcomers. As we add diverse perspectives, our community becomes richer, and we're committed to creating an environment where all people feel welcome. [[Newcomers | Information for new contributors is available here.]


OpenZFS was announced in September 2013 as the truly open source successor to the ZFS project. Our community brings together developers from the illumos, FreeBSD, Linux, and OS X platforms, and a wide range of companies that build products on top of OpenZFS.

OpenZFS is an outstanding storage platform that encompasses the functionality of traditional filesystems, volume managers, and more, with consistent reliability, functionality and performance across all distributions:

illumos Webpage GitHub
FreeBSD Webpage GitHub
ZFS on Linux Webpage GitHub
OpenZFS on OS X Webpage GitHub


Matt Ahrens and George Wilson gave a talk on OpenZFS Basics at SCALE16x, March 2018. Slides and Video

The ZFS User Conference was held April 2018. Videos now posted.

Matt Ahrens will give a talk at BSDCAN: Want to add a disk to OpenZFS' RAID-Z?, June 2018

Sara Hartse will give a talk at BSDCAN: 100x Faster Clone Deletion for ZFS, June 2018

OpenZFS Developer Summit will be held September 10-11, 2018.

OpenZFS Developer Summit 2018 <-- click for more info

The sixth annual OpenZFS Developer Summit will be held September 10-11, 2018 in San Francisco. You can register for the event on EventBrite.

Talks: Day 1

Title Speaker Company
State of the Union Matt Ahrens Delphix
ZIO Pipeline Explained George Wilson Delphix
zrepl, a one-stop ZFS replication solution Christian Schwarz Student
Observing and Monitoring ZFS Metrics Using Open Source Tools Richard Elling Newisys
Managing ZVOLs with vzvol Rainbow Moogsoft
ZFS Hardware Acceleration with QAT Weigang Li Intel
ZoL Releases Tony Hutter LLNL
Device Removal Matt Ahrens Delphix
iRAID Shailendra Tripathi Tegile, a Western Digital Brand

Talks: Day 2

The bulk of this day will be spent on the hackathon but in the morning we'll have a few shorter talks and discussions, around 10-20 minutes each:

Title Speaker Company
Log Spacemap: Flushing algorithm and performance Serapheim Dimitropoulos Delphix
DRAID Rebuild Performance Carles Mateo Newisys
Send Dedup Paul Dagnelie Delphix
Allocation Classes Don Brady Delphix
Vdev Properties Allan Jude Klara Systems

Diamond Sponsors

Platinum Sponsors

Automated Testing

Pull requests submitted to our GitHub page are automatically tested, by running ztest and the ZFS Test Suite. We use illumos VM's running on AWS to perform the tests, and results are available publicly.

Thanks to infrastructure sponsor Nexenta for covering our AWS hosting costs!  


The high-level goals of OpenZFS are:

  • to raise awareness of the quality, utility, and availability of open source implementations of ZFS
  • to encourage open communication about ongoing efforts to improve open source ZFS
  • to ensure consistent reliability, functionality, and performance of all distributions of ZFS.

The main technical goal of OpenZFS is easier sharing of code between platforms. Strategies include:

We accept donations to cover our ongoing costs.

OpenZFS is an associated project of SPI (Software in the Public Interest). SPI is a 501(c)3 nonprofit organization which handles our donations, finances, and legal holdings. You can donate through paypal using the link below:


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All main pages (alphabetical order) …