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Module 1: Introduction to Operating Systems

20257m

Illustrate the concept of Virtual Machines.

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Virtual Machine

VM is software emulation of physical machine via hypervisor.

  • Type1 (bare-metal): hypervisor on hardware (VMware ESXi, Xen)
  • Type2 (hosted): hypervisor on host OS (VirtualBox)
    Components: virtual CPU, virtual memory, virtual devices. Isolation, snapshot, migration. Uses: server consolidation, testing, cloud. Advantages: isolation, resource utilization. Cost: overhead, I/O virtualization. Example: running Linux+Windows simultaneously.

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