In today's business and the digital age highly available heterogeneous systems are an integral part of every company. These technologies support the business and make it easier to work as employees and customers which companies provide services. With the development of technology these systems are constantly enhance by bringing a greater level of security, reliability and performance increase. The aim of this infrastructure is to provide high availability of services they provide. They consist of a whole range of components in a heterogeneous environment to form one system and returns resistance to outbursts of any component or even more of them in their work. The essential components that make up this system are certainly a storage servers, virtualization servers and network equipment that connects all components. Virtualization technology brought progress in this segment as it allows maximum use of the server, and they can serve for a full range of technological solutions, while earlier it was not the case. When creating a highly available infrastructure we are using the various technologies like shared storage systems, servers, network core, virtualization hypervisors, heterogeneous operating systems, network services and databases. Although initially demand significantly greater investment they justify this by providing a reliable and continuous operation as well as easier future upgrades, which in the long run result in the return of investment and financial profitability which directly contributes to faster and easier growth off the company. These companies are the primary users of such solutions. With the development of technology nowadays is possible alternative solution in the form of cloud computing, but behind these technologies are again stands already described systems. Cloud computing brings some reduction of initial investment by companies, ease of use and configuration. While the small and medium big companies opt for such a solution, the world's major companies use independent highly available on premises solutions that are in their possession.