Patent ID: 9053216
Filing Date: 2015-06-09
Classification: G06F,Y02B,Y02D

Abstract:
1. A method for determining when to capture a screenshot image file representing a virtual machine's display output by observing the entropy of virtual CPU register values over time as obtained from a hypervisor in communication with the virtual machine's virtual CPU, comprising: receiving, at a backup image file automated verification server, a backup image file that comprises a representation of the contents of a source bootable block storage device; providing the backup image file to a hypervisor for use by a virtual machine; retrieving, from the hypervisor, a plurality of virtual CPU register values for at least one virtual CPU register of the virtual machine; calculating, for the at least one virtual CPU register, an at least one register entropy value based on the plurality of virtual CPU register values; determining, using the at least one register entropy value, a boot state value for the virtual machine; and capturing, when the boot state value indicates the virtual machine is in a boot success state, a screenshot image file representing the virtual machine display output.