Virtualisering is a way for running multiple servers on same physical hardware. On the servers we run software from VMWare or KVM,one of the leading software for virtulisation.
We are using HP-Servers with service and support agreement for making sure we always have machines working. We also connect our servers in a redundant supported way.
This way we always have the servers connected to the network. In case of a serious problem we do have backup clusters that can take over and run the services.
All our services are behind multiple internet connections for best possible redundancy.
All our virtual servers are publicly open on internet. It is up to each customer to maintain highest security. But we offer firewalled services if needed. But will be extra charges after initial setup if changes is needed.