NetApp said Monday that current board chairman and former CEO Dan Warmenhoven will step down from his position. NetApp CEO Tom Georgens will replace him as board chairman. Also, Nicholas Moore, a lead independent director at NetApp, will retire from the board . Michael Nevens, a senior advisor at private equity fund Permira, will become lead independent director. Based in Sunnyvale, Calif., NetApp is a provider of storage and data management solutions.