In his own blog yesterday, Schwartz reminded NetApp of the futility of IP litigation aimed at "stifling open source," made clear that Sun never approached NetApp about licensing or filed any claims, and pointed out that Sun's approach is to
use our patent portfolio to protect communities, and indemnify customers -- you need only look back to our settlement with Kodak when they attacked the Java community.
Then he graciously thanked NetApp for filing the suit, because in doing so, the company is publicizing ZFS among its customers:
Finally, and perhaps most importantly[...] I'd like to thank our friends at NetApps for ensuring every single customer in their installed base is aware of the outstanding economics offered by ZFS as a file system and storage virtualization.
According to Computerworld, Sun calls the suit "a direct attack on the open source community."