For years I've used or relied upon virtualization technologies such as User Mode Linux, FreeBSD Jail, VMWare, Parallels, and Xen (by virtue of EC2). All of these represent a kind of vertical or narrow virtualization, where you have a single box and are sliding into it as many virtual systems as possible. The converse to this is a kind of wide virtualization that spanning many machines.
Continue reading Wide Virtualization.
