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OpenZFS on OS X brings OpenZFS features to Apple's OS X.

The first installer release of OpenZFS on OS X is ready for use by people who are comfortable with administering ZFS from the Terminal or who are willing to learn to do so. It's compatible with OS X 10.8 and 10.9 (Mountain Lion and Mavericks).

Support and Documentation

Documentation is available on

Support is available on

To use the official release

Download the most recent installer from the O3X wiki and follow the instructions for installing the official release.

To begin testing the most recent build

The O3X wiki has instructions for installing from source.

To test without building

Development Build DMGs are added to – download the most recent signed .dmg file if you are on OS X 10.9, unsigned if you are on an earlier version of OS X. The disk image will contain built software – binaries, kernel extensions (KEXTs) and so on – that may be used with or without installation. Follow the instructions for installing a development build DMG on the wiki.

These development build DMGs sometimes will not include the very most recent commits. If in doubt, please ask on IRC:

Suggested focus areas for testers

  • Evaluating performance of various pool configurations as well as performance on older pools.
  • Identifying any abnormal behavior when used with older pools.
  • Finding incompatibilities with 3rd party software.


When using beta software with data of significant value, be especially diligent with your backup procedures. Remember that ZFS alone is not a substitute for a good backup strategy.

If you have MacZFS 74 or ZEVO installed:

  • you must uninstall that software before testing O3X (scripts for doing so are included with the O3X release download).
  • you must uninstall O3X before reverting to ZEVO or MacZFS 74 (an uninstaller script for O3X is also included with the release download).

Either unload the older kernel extensions or reboot before proceeding with installing O3X.