On a zSeries machine, using LPAR and z/VM for Linux deployments presents a multitude of possibilities not available anywhere else. There can be substantial hardware and floor space savings from using virtualization technology on a zSeries machine. Virtualization technology gives you a flexible server farm environment that can be easily managed and changed in minutes with a few keystrokes.
The purpose of z/VM's efficient virtualization technology is to:
Much of the appeal of running Linux on the mainframe comes from the ability to run tens to hundreds of Linux images on a single machine.