Penguin Computing, a company that sells Linux cluster virtualization, which makes groups of Linux servers appear and act like a single virtual system, has raised $9 million more in funding.

The advantage of cluster virtualization is that it allows control of thousands of systems as if they were a single system, which simplifies management.

The round was led by vSpring Capital, with participation from existing investors, San Francisco Equity Partners, Weber Capital and Convergence Partners.

The latest round appears to be a recapitalization of sorts, because it is referred to as the company’s round “two” of capital. Penguin was founded in 1998, and had already raised $25 million through several rounds, including from Convergence Partners, London Merchant Securities, San Francisco Equity Partners, Sunrise Venture Capital and Weber Capital Management.

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