There have been rumors about Apple to include support for the ZFS file system designed by Sun. These rumors date back even before Sun CEO Jonathan Schwartz announced in 2007 that Leopard would utilize ZFS as its file system.
It even made an appearance in Disk Utility in a beta of Mac OS X 10.5. ZFS support was never included in Leopard. However, it was also initially hinted in Snow Leopard Server documentation in 2008 before the final public release.
In 2009, Apple had seemingly ceased all work on ZFS. According to a 2011 Ars Technica article profiling, an Apple engineer named Don Brady who worked on the ZFS team at Apple until 2009, “Apple couldn’t reach suitable license terms with Sun” at the time, and Brady eventually left to form his own company in 2010 called Ten’s Complement. Two years later, Brady and Ten’s Complement are set to bring ZFS support to Mac OS X with the company’s latest project, ZEVO Silver Edition.
The Silver Edition is just the first product from Ten’s Complement. It includes basic ZFS support for $19.95. Other products will follow including a $40 Gold Edition and a Platinum Edition with support for RAIDZ and other advanced features. A Developer Edition will provide devs with “conventional ZFS command line tools,” Graphical User Interface (GUI) options, and customization options. According to online reports, the MacZFS open source project is also continuing development on the original work done by Sun and Apple.
Source: 9TO5 Mac