Continuous Uptime of Guest Virtual Machines During Upgrade of a Virtualization Host Device

摘要

Systems and methods for providing a continuous uptime of guest Virtual Machines (“VMs”) during upgrade of a virtualization host device. The methods comprising: connecting all of the guest VMs' frontends or drivers to at least one old control VM which is currently running on the virtualization host device and which contains old virtualization software; creating at least one upgraded control VM that contains new virtualization software and that is to replace the old VM in the virtualization host device; connecting the guest VMs' frontends or drivers to the upgraded VM; and uninstalling the old control VM from the virtualization host device.