![]() ![]() It allows effectively taking the physical resources in the physical host and dividing them up so virtual environments can use them. The hypervisor effectively creates the layer of abstraction between the virtual instance of a computer and the underlying physical hardware. The unique software that makes virtualization in computing possible is called a hypervisor. This unique capability provided by virtualization in computing has been made possible by a particular type of software known as a hypervisor. ![]() Virtualization in computing has opened up many opportunities to create IT services and software inside virtualized instances traditionally meant to be bound to physical hardware systems. It also means the applications and software running on top of the virtual computer are also unaware they are running in a virtualized environment. Virtualization technologies enable the virtual computer to run unaware of this abstraction layer from the physical hardware. What is this technology we refer to as virtualization? In its simplest form, virtualization allows running a virtual computing system in an abstracted layer from the physical hardware on which it is running. It also made hardware and software vendors rethink their technologies and strategies for the upcoming years and helped utilize the growing power of hardware technologies. The technology debuted by VMware helped organizations realize the benefits of running multiple “virtual” servers on top of the physical hardware. However, the world was not ready to capitalize on virtualization technology until decades later, when VMware introduced its solution. Virtualization has been around since the late 60s when IBM created a new mainframe based on a virtual machine monitor or hypervisor. You can read VMware’s very interesting and impressive pioneering of virtualization technology here: VMware History and Interactive Timeline. After VMware introduced ESX Server 1.5, a new era of enterprise data center technology was about to begin. In 2002, a little company called VMware released its first server hypervisor, ESX Server 1.5. As a result, many began to see the inefficiencies of running a single operating system installed on a single physical set of hardware. However, by the early 2000s, server hardware was starting to outpace operating systems and software requirements. However, even with large amounts of RAM and CPU cycles for the time, most server hardware was only powerful enough to run the single server operating system on top of the physical hardware. Application servers ran large monolithic applications on servers outfitted with “large” (for those times) quantities of RAM and extra CPU capacity. We had one operating system running on one set of hardware. If you have been in IT for some years now, you undoubtedly remember the days when we ran everything on physical servers in a 1-to-1 fashion. What is virtualization made possible with a hypervisor? How have modern virtualization technologies evolved from the early days of server virtualization? A look back at the birth of virtualization It has led to a paradigm shift in organizations’ pace, innovation, and agility and is an underlying technology making the cloud as we know it possible. Virtualization and the technologies that include virtualized resources have changed the way businesses think about hardware, software, applications, and infrastructure. It has been one of the defining moments and turning points in modern technology – virtualization in computing.
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