UML uses emulated system calls and emulated disk drivers which make it very slow, especially when it comes to context switches and disk I/O. Xen itself is a hypervisor with the base operating system simply being a VM under it. This makes it have very low overhead (2-8%). Linux VServer is a shared kernel with security isolation so it lacks many features such as no low level networking, IPSec, IPv6, iptables, ebtables, loadable kernel modules, etc.

Nope. XEN/UML/QEMU and VServer are just good friends. Because you ask, you probably know what XEN/UML/QEMU are. VServer in contrary to XEN/UML/QEMU not "emulate" any hardware you run a kernel on. You can run a VServer kernel in a XEN/UML/QEMU guest. This is confirmed to work at least with Linux 2.6/vs2.0.

XP is a development process; UML is a design notation. Most XPers are fluent in UML, and periodically draw UML diagrams on marker boards to work out design issues. Most XP projects don't have reams of printed UML diagrams, although there may be a brief design overview document that contains a few simple diagrams to show canonical class relationships in the system.

The POSIX.1 standard specifies application programming interfaces (APIs) at the source level, and is about source code portability. Its neither a code implementation nor an operating system, but a stable definition of a programming interface that those systems supporting the specification guarantee to provide to the application programmer.

Hi, I have followed the guide as far as I can see but I get the following error. I would appreciate some help in resolving this. Thanks I followed the great documentation and when I run the vserver start i get the following error can anyone help

Xen currently runs only on the x86 architecture, requiring a "P6" or newer processor (that's any Intel or AMD x86 CPU purchased in the last five years). Multiprocessor machines are supported, including basic support for Hyper-Threading (SMT). Support for x86/64 is available since Xen 3.0. In addition a port to the IA64 architecture is approaching completion. We hope to add other architectures such as PPC and ARM in due course.

They are complimentary approaches. UML is suitable for detailed modeling of aplications developed using object oriented languages. Dependency Models are useful for understanding, communiciating and maintaining the big picture view of the application architecture. You can find a more detailed explanation here.

We use Virtuozzo for our VPS servers. This is because Virtuozzo is mature compared to Xen, and resources are burstable. Virtuozzo also provides web based interface for users to control their VPS, including backup, restore and restart.

Yes. A good whitepaper on virtualization and the difference between virtualization technologies is What is Virtualization?, conveniently available from Red Hat.

Xen is a virtual machine monitor (VMM) for x86-compatible computers. Xen can securely execute multiple virtual machines, each running its own OS, on a single physical system with close-to-native performance.

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There are no known issues about running vserver on a preemption enabled kernel. I would like to add, that the vserver kernelhackers would probably exclude that option in 'make menuconfig' if there would be an incompatibility. Just my $.02 :)

FreeBSD is very similar to Linux in that it also relies on a large number of GNU packages. Most of the packages available for Linux are also available for FreeBSD. The arguments comparing FreeBSD to Linux center around the differences between how various kernel functions are implemented. Depending on the area you look at, either Linux or FreeBSD will have a better implementation.

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