Building a dynamic datacenter 19 n n n n n n Virtualization Infrastructure Driver (VID)--The VSD provides partition management services, virtual processor management services, and memory management services. VMBus--The VMBus is a channel-based communication mechanism. It enables interpartition communication and device enumeration. It is included in and installed with Hyper-V Integration Services. Virtual Machine Management Service (VMMS)--The VMMS is responsible for managing VM state associated with all child partitions. A separate instance exists for each VM. Virtual Machine Worker Process (VMWP)--The VMWP is a user-mode component of the virtualization stack. It enables VMMSs for the root partition so it can manage VMs in the child partitions. Virtualization Service Client (VSC)--The VSC is a synthetic device instance residing in a child partition. It uses hardware resources provided by VSPs. A VSC and VSP communicate via the VMBus. Virtualization Service Provider (VSP)--The VSPs reside in the root