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Re:Mac OS X - The state of the file system (2011) by terhechte on Thursday November 14, 2013 @09:02AM (#6732276)
For the adventurous, there's Zevo [1] which is a port of ZFS to Mac OS X that supports all the fine grained details of the operating system:

"ZEVO’s file system is fully integrated into the Mac’s unique OS environment and implements quotas, ACLs, and the HFS+ programming interfaces like search-fs, id lookups, bulk access calls and resource fork stream access."

If I remember it correctly, the company is run by the guy that was responsible for the ZFS-Mac OS X integration at Apple that was canned shortly before 10.6 was released.

[1] http://getgreenbytes.com/solutions/zevo/

Re:Mac OS X - The state of the file system (2011) by rentzsch on Thursday November 14, 2013 @09:21AM (#6732392)
Sadly ZEVO looks to be in trouble, if not dead [1]. Even Don Brady (the lead engineer behind ZEVO) has reluctantly returned to HFS+ on 10.9 [2].

[1] http://jollyjinx.tumblr.com/post/64863395820/time-to-say-goo...

[2] https://twitter.com/DonJBrady/status/393028766554812416