How is Resource Partitioning Manager different from VMware ESX Server?
Though they can provide similar functionality, Resource Partitioning Manager (RPM) and ESX Server are distinctly different. With RPM, multiple partitions are created on a single Windows 2000 operating system. With VMware ESX Server, each partition runs on its own operating system leading to multiple operating systems on a single server. While RPM can enable application consolidation under a single operating system with defined resources, ESX Server provides physical consolidation – multiple virtual servers on one piece of hardware.