graph {
	subgraph cluster_lowsoft {
		softnet [label="Software Networking"]
		ceph [label="Shared Storage"]
		softmem [label="Shared Memory"]
		softcpu [label="Shared Computing"]
	}
	computer [label="Hardware Computer", shape=box]
	subgraph cluster_res {
		label="Resources"
		memory [shape=diamond]
		computing [shape=diamond]
		storage [shape=diamond]
		networking [shape=diamond]
	}
	one [label="Virtualization", shape=box]
	computer -- {computing, memory, storage, networking}
	{computing, memory, networking} -- softnet [color=red]
	{computing, storage, networking} -- ceph [color=red]
	computing -- softcpu [color=red]
	memory -- softmem [color=red]
	{ceph, softcpu, softnet, softmem} -- one [color=blue]
	www [label="Web Server"]
	smtp [label="Mail Server"]
	app [label="Application Server"]
	one -- {www, smtp, app}
}