OpenStack promises a lot: Robust clouds that can support both specialized private and massive public workloads but without fear of vendor lockin. And that is a lot to promise. On this week’s show, we’ve got not one but two heavy-hitting proponents, Jonathan Bryce and COO Mark Collier, telling us why, exactly, big companies should check out the new Icehouse release of the open-source cloud framework (available Thursday!) OpenStack Foundation COO Mark Collier (L) and Executive Director Jonathan Bryce (R) To satisfy one key demand, Icehouse will enable rolling upgrades from the previous without shutting down workloads.