Suggestions for management VM cluster

We currently have some VMs to manage the rest of our servers. They are used for stuff like monitoring, alerting, configuration management, dns, independent firewall, ipmi access, etc. Because of the obvious bootstraping and security issues they are running on two seperate Linux servers under VirtualBox.

The problem with this is that if one of the management servers go down then we have no way to start the VMs running there and it may take some work to get tjem back up again. We are therefore looking to combine the servers ito a small VM cluster where we can do HA.

It looks like most virtualization solutions are either single node or requires a SAN. We are currently looking at ganeti but there does not look to be any automatic HA.

Is there any better options? What do you do with those vital services? I would hate to have to make something myself if there is something out there already.