Like every project, a High Availability (HA) scenario starts with a planning phase. Virtualization projects are often turning up the question for additional availability for the first time in an environment. In traditional data centers with physical server systems and local storage systems, an outage of a hardware component will only affect one server hosting one service. The source of the outage can be localized very fast and the affected parts can be replaced in a short amount of time. Server virtualization comes with great benefits, such as improved operating efficiency and reduced hardware dependencies. However, a single component failure can impact a lot of virtualized systems at once. By adding redundant systems, these single points of failure can be avoided.