OpenZFSOnOSX



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 10.6 through OS X 10.9 (Snow Leopard, Lion, Mountain Lion and Mavericks).

Support and Documentation
Documentation is available on

Support is available on
 * O3X wiki http://o3x.org/wiki or http://openzfsonosx.org/wiki


 * O3X forums http://o3x.org/forum or http://openzfsonosx.org/forum


 * #openzfs-osx IRC channel irc://chat.freenode.net/#openzfs-osx

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 http://lundman.net/ftp/osx.zfs/ – 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:


 * irc://chat.freenode.net/#openzfs-osx

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.