Oracle and NetApp 'mutually dismissed' in 2010:

* https://www.theregister.com/off-prem/2010/09/09/oracle-and-n...

* https://www.computerworld.com/article/1585889/opinion-patent...

NetApp originally sued then-independent Sun in 2007, and Sun counter-sued.

Free/TrueNAS/iXsystems has been offering ZFS-based solutions for many years now, and I haven't heard NetApp going after them:

* https://en.wikipedia.org/wiki/TrueNAS

* https://en.wikipedia.org/wiki/IXsystems