Published at LXer:
Virtualization is all the rage these days. Advances in x86 performance, as well as the increasing energy requirements of servers, make efficiently provisioning machines a necessity. Xen, an open source virtual machine (VM) monitor, works with just about any Linux distribution. One useful feature for shops that care about high availability is Xen's ability to migrate virtual machines while they are running. By using VM migration, you can pool computing resources just as you can pool storage. Here's how.