How Virtualization Works

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Virtualization 101


Due to the limitations of x86 servers, many IT organizations must deploy multiple servers, each operating at a fraction of their capacity, to keep pace with today’s high storage and processing demands. The result: huge inefficiencies and excessive operating costs.

Enter virtualization. Virtualization relies on software to simulate hardware functionality and create a virtual computer system. This enables IT organizations to run more than one virtual system – and multiple operating systems and applications – on a single server. The resulting benefits include economies of scale and greater efficiency.

Virtual Machines Explained

A virtual computer system is known as a “virtual machine” (VM): a tightly isolated software container with an operating system and application inside. Each self-contained VM is completely independent. Putting multiple VMs on a single computer enables several operating systems and applications to run on just one physical server, or “host.”

A thin layer of software called a “hypervisor” decouples the virtual machines from the host and dynamically allocates computing resources to each virtual machine as needed.

Key Properties of Virtual Machines

VMs have the following characteristics, which offer several benefits.

Partitioning
  • Run multiple operating systems on one physical machine. 
  • Divide system resources between virtual machines.
Isolation
  • Provide fault and security isolation at the hardware level. 
  • Preserve performance with advanced resource controls.
Encapsulation

  • Save the entire state of a virtual machine to files.
  • Move and copy virtual machines as easily as moving and copying files.
Hardware Independence

  • Provision or migrate any virtual machine to any physical server.

Fuente: https://www.vmware.com/solutions/virtualization.html

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