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Network Appliance has sued Sun Microsystems, claiming Sun's ZFS file system technology infringes on seven NetApp patents.
In the suit filed in the U.S. District Court for Eastern Texas, NetApp is also seeking a declaration that it is not infringing on three of Suns U.S. patents and that those patents are invalid.
The dispute affects NetApp's WAFL file system and RAID technologies.
NetApp said in a press release that it is filing the suit "in the wake of prolonged and aggressive claims" by Sun. Sun inherited the dispute when it acquired StorageTek two years ago.
"Sun's aggressive demand that we license some of their IP caused us to examine carefully whether we were infringing their IP rights and whether they might be infringing ours," NetApp said. As a result of that review, NetApp said it "believes Sun unfairly distributes ZFS technology to third parties to induce the adoption and distribution of the infringing technology in their products without informing them of applicable NetApp patents."
NetApp said it made "major efforts" to resolve the issues, but Sun "shifted from an aggressive position to not being responsive, leaving important issues unresolved. To remove any doubts, NetApp has turned to the courts."
In a statement late Wednesday, Sun responded that NetApp's lawsuit "is a clear indication that NetApp considers Sun technology a threat, and is a direct attack on the open source community. ... Many of the claims raised in the lawsuit are factually untrue. For example, it was NetApp who first approached Sun seeking to acquire the Sun patents NetApp is now attempting to invalidate. It is unfortunate that NetApp has now resorted to resolving its business issues in a legal jurisdiction (East Texas) long favored by 'patent trolls.'
"Bottom line, Sun indemnifies its customers, and stands behind the innovations we deliver to the marketplace."