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ZFS came first and Oracle started btrfs to try to clone it, before they acquired Sun anyway. btrfs has never really matured. It has only a fraction of the feat

• yjftsjthsd-h 4y ago
  > before they acquired Sun anyway. This is the one that really burns me. There was a moment there where Oracle could have re-licensed ZFS, gotten it merged directly into linux, and had the best file system for their Linux distro. They even did it for dtrace! Instead, whether it was because they were so attached to their own pet project or other reasons, they just did nothing and now we get to live with the consequences forever because they don't own all the copyrights on OpenZFS so they can't even change the license on it now if they wanted. (Strictly, they could relicense their own Solaris code for ZFS, but that would be quite an effort to rework and leave us with two incompatible implementations.)