On-line replacement and changing of virtualization software

Electrical computers and digital processing systems: virtual mac – Task management or control – Process scheduling

Reexamination Certificate

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Details

C718S001000, C718S100000, C718S105000, C717S168000, C717S170000

Reexamination Certificate

active

07814495

ABSTRACT:
In a virtualized system running one or more virtual machines on a first hypervisor, a second hypervisor is installed and control of the hardware resources of the physical computer supporting the virtualized system is migrated from the first hypervisor to the second hypervisor without interrupting the operation of the first hypervisor and the virtual machines. Initially a minimal set of hardware resources is hot-removed from control by the first hypervisor, and the second hypervisor is launched on the minimal set of hardware resources. Both the remaining hardware resources and the virtual machines are then migrated from the first hypervisor to the second hypervisor until all the virtual machines have been migrated over to the second hypervisor, while the virtual machines and the first hypervisor continue running largely unaffected by the migration process.

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