I am reading that DoD through the Defense Information Systems Agency (DISA) has launched in production their cloud solution called RACE which is assuring a ☞ 5 nines (99.999%) availability SLA. As a comparison both Google and Amazon SLA’s are just 3 nines (99.%), the difference being from 5min/year downtime to 8.76hours/year.
RACE runs on top of HP hardware with a VMWare virtualization layer and can accommodate both Windows and Linux OSes.