The round was led by Hummer Winblad and True Ventures, with participation from Divergent Ventures and others.
In conjunction with the funding, Lars Leckie from Hummer Winblad, and Puneet Agarwal from True Ventures will join Piston’s board of directors.
Founded by CEO Joshua McKenty and CTO Christopher MacGown, Piston delivers enterprise-class software built on OpenStack, an open source cloud platform launched by NASA and Rackspace in 2010. Today it has over 1,100 contributors and 82 participating companies, including Rackspace, NASA, Citrix, Intel, Cisco, Arista Networks and Dell.
Piston Cloud technology is currently in limited beta, with a public release expected in the fourth quarter of 2011.