Virtualisation is often touted as a great way to save money and manage the infrastructure. Even though the benefits have been listed down time and again, it is not unless one actually virtualises the infrastructure that they become evident
Consolidation of servers through virtualisation has benefits other than cost savings. A traditional server would have to be taken offline for maintenance or upgrades. With virtualisation, all of the server's consolidated workloads can be migrated to a spare server or distributed amongst other servers, and then the original server can be shut down without any disruption to the workloads. Once the work is completed, the workloads can be migrated back to the original hardware. Workloads from a failing server can likewise be failed over or restarted on other servers, minimising the effect of hardware problems.
Virtualisation technology not only addressed server under utilisation, but also provided additional benefits such as improved manageability and a reduction of power and cooling costs. Reducing the number of physical servers reduced capital costs, data centre complexity, and administrative costs. Additionally, server virtualisation enhanced business continuity strategies and business agility.
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