OSX source is open
Cool: the source code for OSX is available online at opensource.apple.com:
10.6.2 10.6.8 more.
(found while searching for AppleRAID)

OSX used to handle mirroring and striping nicely"RAID 10 is a supported RAID level available in Disk Utility up to OS X Yosemite. With the release of OS X El Capitan, Apple removed direct support ( Read more... )