Howto setup XEN virtual machine on Fedora Core 6 x86
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Xen is also largely obsolete in the open source virtualization world since Citrix bought it. You should be looking at KVM instead.
Xen is not obsolete. Citrix XenServer is based on Xen and it is Open Source again, which is now called Xen Cloud Platform (XCP). The development of Xen is still very active, however Red Hat has decided not to package it by default anymore. Instead Red Hat is promoting KVM and their standard virtualization solution is based on KVM.
Edit: Xen is the hypervisor and XCP is a complete distribution for cloud computing using Xen Hypervisor.
True, but that doesn't mean that KVM is preferred. No matter how much I appreciate the work that the kernel developers do, that doesn't mean that their decisions are the preferences of the people who are using it. I believe that the freedom of choice is the main reason why many of like to use linux. So personally I think you should be a bit more careful about telling what is preferred or not. Because if it is important to use what is preferred, then you should tell to use VMware since it has the biggest install base.
KVM is nice, but if I remember well it is still lacking some features that Xen does have. However when you say that KVM is easier to use than Xen, I must admit that you are right. The reason for that is that it is integrated in the mainline kernel. But according to the latest research I have read, Xen is still used a lot more than KVM. So who decides what is preferred or not?