FYI: actually the vmware kernel leverages many open source drivers from the linux kernel and I highly suspect that it is in fact a custom linux kernel. some evidence that supports this view is the recent attempt of vmware to join the linux-distros mailinglist to get early access to vulnerabilities in open source code. you can just join this list if you offer a kind of "linux" distribution (or something very close to it). here is a thread for further reading on the case: http://seclists.org/oss-sec/2014/q2/403 PS: regarding ovirt-node: it's actually a very trimmed down linux system, just enough to act as an hypervisor, so it's bare metal virtualization (I would even argue that there is no such thing as a type 1 hypervisor, because if you talk about type 1 hypervisors the hypervisor itself is the operating system kernel, which is also the case for kvm, as it is a linux kernel module). HTH Am 07.08.2014 14:03, schrieb Gianluca Cecchi:
VMware says esxi is a bare-metal hypervisor and there is not an underlying os. Someone else says it is based on vmkernel operating system ( where vmkernel is defined as a posix-like operating system). In my opinion the oVirt node is to be intended something like ESXi: an os with the smallest possible footprint, dedicated to run as a KVM hypervisor. The difference being that it is based on Linux and not developed from scratch.
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