Looking to boost its presence in the market for data centers using flash storage, NetApp (NTAP) said on Monday that it will buy SolidFire for $870 million in cash, reports The Deal's Chris Nolter. NetApp CEO George Kurian told investors in a call after the market close on Monday that the market for all-flash data centers is the fastest-growing segment of the storage business. Still, shares of NetApp declined $0.58 cents, or more than 2 percent, to $27.02 in after-hours trading. Founded in 2009, SolidFire of Boulder, Colo., has backing from New Enterprise Associates, Valhalla Partners, Novak Biddle Venture Partners, Samsung Ventures and Greenspring Associates. NetApp, which has an $8 billion market cap, has struggled to grow its business. The top has declined for nine consecutive quarters, UBS analyst Steven Milunovich wrote after the company's November earnings release, reflecting 'both a weak industry and ebbing NetApp position.' The Deal's Richard Collings has details from New York.