While VMware is the reigning private cloud king, performance and costs issues are driving some enterprise users into the arms of OpenStack.
OpenStack and private cloud may already be déclassé to some in the rapidly changing infrastructure landscape, but don't tell that to enterprise IT, which continues to bank on the potential of both.
Public cloud reliability concerns continue to push enterprise IT shops to invest in private cloud. And while VMware remains the market leader, performance issues and expensive licensing fees may lead more users to OpenStack for private cloud.
"A lot of people are trying to get away from VMware," said Al Sadowski, research director for service providers for 451 Research, based in New York. "They don't want to pay the VMware tax. They're looking for open source alternatives and they are increasingly going to OpenStack."