Recommended system requirements for a decent oVirt installation are huge by comparison with Kimchi's. However, Kimchi is much less configurable than oVirt. So far as I can make out, oVirt is best suited for clustered virtualization whilst Kimchi aims mainly for single server virtualization. At least, that's how I'm using it and it seems to work well. I asked our sys admin whether oVirt would work for my HP MicroSever and he said something more lightweight would be better.