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Welcome to OpenZFS


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

The ZFS User Conference was held April 2018.

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 the week of September 10, 2018.

OpenZFS Developer Summit 2018 <-- click for more info

The sixth annual OpenZFS Developer Summit is being planned, and will be the week of September 10, 2018 in San Francisco. Watch this space for more details.

You can see details about last year's conference on the OpenZFS Developer Summit 2017 page

Diamond Sponsors

  • datto
  • Delphix

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! Nexenta


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:

Site orientation

All main pages (alphabetical order) …