Virtualization technology is being widely applied thanks to the flexibility, fast, stable and easy administration that it brings. At the same time, any IT technology - hardware or software - can only function properly under full maintenance, and so does the VMware platform. With physical servers, the error or poor performance of the system affects the applications that run on it. With the virtualization platform, multiple virtual machines (VMs) run on the same physical server, and server slowness will affect applications that run on all VMs. Therefore, performance monitoring is even more important within the virtualized infrastructure than the physical infrastructure.