So What's Xen Again? (And Why Should I Use It?)

Even if you're not interested in this sort of grid computing thing, Xen offers some advantages to both the system administrator and the home user.

Xen is a piece of software that enables one machine to behave as if it were many virtual machines. Each of these machines can run its own operating system and exist almost independently of the other virtual machines running on the same hardware. Each virtual machine (an instance, or domain in Xen parlance) has its own apparent network interfaces, disks, and memory.

At first, this makes Xen seem no different from an emulator, such as VMware, Microsoft's Virtual PC, or the open source QEMU.[4] However, these traditional emulators work by running software on ...

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