VirtualBox is one of the most popular virtual machine programs since it is free, open source, and available on all the popular operating systems. Some options are VirtualBox (Windows, Linux, Mac OS X), VMware Player (Windows, Linux), VMware Fusion (Mac OS X) and Parallels Desktop (Mac OS X). There are many different virtual machine programs you can use. Also, when many virtual machines are running at the same time on a single computer, performance can become unstable. Since hardware resources are indirect, they are not as efficient as a physical computer. There are a few drawbacks with virtual machines. Each piece of virtual hardware is mapped to real hardware on the host computer. Virtual machines have virtual hardware, including CPUs, memory, hard drives, and more. Often a server will use a program called a hypervisor to manage multiple virtual machines that are running at the same time. Virtual machines are also used to quickly set up software with an image, access virus-infected data, and test other operating systems.Ī single physical computer can run multiple virtual machines at the same time. For instance, if you are using a Mac computer you can run Windows programs inside a Windows virtual machine on the Mac computer. Virtual machines are often used for running software on operating systems that software wasn't originally intended for. This means that nothing that runs on the virtual machine can impact the host computer. Virtual machines are sandboxed from the host computer. It is basically a way to create a computer within a computer.Ī virtual machine runs in a window on the host computer and gives a user the same experience they would have if they were using a completely different computer. You can also run a single purpose VM to support a specific process.A virtual machine is a program you run on a computer that acts like it is a separate computer. VMs provide additional disaster recovery options by enabling failover and redundancy that could previously only be achieved through additional hardware.Ī VM provides an environment that is isolated from the rest of a system, so whatever is running inside a VM won’t interfere with anything else running on the host hardware.īecause VMs are isolated, they are a good option for testing new applications or setting up a production environment. This keeps you from needing to purchase additional physical resources, like hard drives or hard disks, as well as reducing the need for power, space, and cooling in the datacenter. By virtualizing your servers, you can place many virtual servers onto each physical server to improve hardware utilization. Most operating system and application deployments only use a small amount of the physical resources available when deployed to bare metal. Server consolidation is a top reason to use VMs. Each operating system runs in the same way an operating system or application normally would on the host hardware, so the end user experience emulated within the VM is nearly identical to a real-time operating system experience running on a physical machine. VMs allow multiple different operating systems to run simultaneously on a single computer-like a Linux® distro on a MacOS laptop. The hypervisor treats compute resources-like CPU, memory, and storage-as a pool of resources that can easily be relocated between existing guests or to new virtual machines. The physical machines, equipped with a hypervisor such as Kernel-based Virtual Machine (KVM), is called the host machine, host computer, host operating system, or simply host. The many VMs that use its resources are guest machines, guest computers, guest operating systems, or simply guests. Software called a hypervisor separates the machine’s resources from the hardware and provisions them appropriately so they can be used by the VM. A virtual machine (VM) is a virtual environment that functions as a virtual computer system with its own CPU, memory, network interface, and storage, created on a physical hardware system (located off- or on-premises).
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