Fast boot
摘要
說明書
A “current resource map” is created and maintained by each hyper-kernel instance. This map describes the current mapping between the virtual resource map and the physical resource map from the point of view of each node. For each entry in the virtual resource map, a definition of the physical resources currently assigned to the virtual resources is maintained. Initially (e.g., at boot time), the current resource map is a copy of the initial virtual resource map. The hyper-kernel modifies the current resource map over time as it observes the characteristics of the resource load and dynamically changes the mapping of physical resources to virtual resources (and vice-versa). For example, the definition of the location of the Ethernet controller eth27 in the virtualized machine may at different times refer to different hardware controllers. The current resource map is used by the hyper-kernel to dynamically modify the virtual hardware resource mappings, such as the virtual memory subsystem, as required.
Resource Migration Overview
Using the techniques described herein, virtualized resources, such as virtual general-purpose processors, virtual memory, virtual networks, and virtual disks can be migrated between physical locations. Virtual interrupts may also be remotely delivered. As explained above, the operating system is provided with information about the virtualized system, but that information need not agree with the physical system. As long as the basic hardware abstractions expected by the operating system are not violated, a virtual machine may look to the operating system just like a physical machine.
As described above, in the example software defined server described herein, there is an identical instance of the hyper-kernel running on each node of the cluster that the virtual machine spans.
