Since there are many tiers of software and hardware involved in supporting a VDI service, any issues, in any of these tiers will impact the VDI service. For example, if a Connection server is down, users may not be able to access their virtual desktops, or if a vSphere host is overloaded, users will experience slowness (e.g., slow screen refresh, screen freezes, disconnects, etc). Identifying and resolving such situations is a key to delivering great VDI user experience. This is where VDI monitoring tools come in.