Once upon a time, Apple came very close to releasing ZFS as part of MacOS. Apple did this work in its own copy of the ZFS source base (as far as I know), but the people in Sun knew about it and it turns out that even today there is one little lingering sign of this hoped-for and perhaps prepared-for ZFS port in the ZFS source code. Well, sort of, because it’s not quite in code.
I love stories like this – digital archeology focusing on the relatively recent past.
That’s pretty cool.
OpenZFS on MacOSX (O3X) used to be a good option, but, it seems it isn’t updated so much. Latest version only supports Sierra, and it seems the last post in the FAQ about it says there is a dev branch that supports High Sierra, and that 10.13 support is coming.
10.14 is almost out, though.