Hardware expenses reduction is one of server virtualization benefits. Owing to consolidation of multiple virtual servers within one physical server, virtualization allows cutting expenses spent on server hardware. One physical server can host tens and even hundreds of virtual servers simultaneously.
One more server virtualization benefit is software expenses reduction. Some software vendors have implemented separate licensing schemes especially for virtual environments. For example, buying just one Microsoft Windows Server Enterprise license you receive the right to use it on 1 physical server and 4 virtual ones (within one server). As for Windows Server Datacenter, it is licensed for a certain number of CPUs and can be used in unlimited number of virtual servers.
Maintenance expenses reduction is the next server virtualization benefit. Maintenance of lesser amount of equipment is cheaper and easier.
Electricity expenses reduction. The number of physical machines that work as servers is reduced, which lowers the energy supply. On average, servers are idle 70% of time, while still consuming energy and releasing large amounts of heat. Server virtualization allows spending CPU cycles more efficiently and rise utilization to as high as 90%.
Infrastructure flexibility enhancement. Virtualization allows software to abstract from hardware. Therefore, it introduces the opportunity for virtual machines to migrate between different physical servers. Earlier, if a server started malfunctioning, it was necessary to reinstall OS and restore all the data from backup on that server, which took hours. Now it is enough to perform virtual machine migration from one server to another, no reinstallation involved. Virtual server also demonstrates lower time of deploying solutions of your tasks owing to server systemâ€™s shorter installation, setup and delivery procedure.
Increase in level of fault-tolerance. Virtualization offers means to clusterize the entire server regardless of running software. Even unclusterizable services can be clusterized, too. In such case clasterization in its pure sense doesnâ€™t occur; in fact it is just a virtual machine restarting. But, should a physical server fail, virtual machine will be automatically started on another one without system administratorâ€™s attendance.
Last but mot least servrer virtualization benefit is that testing made simpler. Virtual servers offer a convenient environment for testing software, modeling loads, processes, and tasks. Even if something goes wrong or deviates the expected scenario, only the virtual environment itself will be compromised, while the physical server uninterruptedly runs other virtual machines.
Besides, when testing is performed on virtual machines, they can be migrated from work servers which are exposed to bigger loads to other physical servers.