VIRTUAL MACHINE FAULT TOLERANCE

In a computer system running at least a first virtual machine (VM) and a second VM on virtualization software, a computer implemented method for the second VM to provide quasi-lockstep fault tolerance for the first VM includes executing a workload on the first VM and the second VM that involves prod...

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Bibliographic Details
Main Authors Venkitachalam Ganesh, Malyugin Vyacheslav Vladimirovich, Sheldon Jeffrey W, Scales Daniel J, Jain Rohit, Xu Min, Weissman Boris
Format Patent
LanguageEnglish
Published 26.01.2017
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:In a computer system running at least a first virtual machine (VM) and a second VM on virtualization software, a computer implemented method for the second VM to provide quasi-lockstep fault tolerance for the first VM includes executing a workload on the first VM and the second VM that involves producing at least one externally visible output and comparing an externally visible output of the second VM with an externally visible output of the first VM to determine if there is an output match. In response to a determination that the externally visible output of the second VM does not match the externally visible output of the first VM, a resynchronization of the second VM is executed. The externally visible output of the first VM is kept from being output externally until completion of the resynchronization.
Bibliography:Application Number: US201615284465