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To go Open Source or go proprietary? There is a common conception that open-source is unsafe and insecure and therefore companies should rather go for proprietary solutions. They think that because software is termed "open-source", that the world can see the vulnerabilities of the software and might exploit it, and less informed people tend to think that open-source software can be modified while it is running.
Introduction to KVM KVM is a free and open-source Kernel-based Virtual Machine using the Linux kernel for virualization and is very similiar to a hypervisor like Xen or VMware's ESXi. It is based on Qemu, a processor emulator. Any virtual machine created on or working on KVM can work on Qemu also, but with a great reduction in speed.