Patent · US Active

Virtual machine fault tolerance

US9459895B2 · kind B2 · utility

4Cited by

10References

33Claims

0Family size

Assignee

VMware LLC · US

Inventors

Ganesh Venkitachalam · Mountain View, US
Rohit Jain · New Delhi, IN
Boris Weissman · Palo Alto, US
Daniel J. Scales · Mountain View, US
Vyacheslav V. Malyugin · Palo Alto, US
Jeffrey W. Sheldon · Los Altos, US
Min Xu · Lo Wu, CN

Key dates

Filing date	May 15, 2012
Grant date	Oct 4, 2016
Priority date	—
Expiry date	Aug 11, 2034

Classification

Technology area (CPC G)Physics
CPC primaryG06F2201/82
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

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. The method includes enabling operations of the second VM to diverge from being in lockstep with operations with the first VM without resynchronizing the second VM with the first VM, if output of the second VM is not diverging from output of the first VM. The output of the second VM is compared with the output of the first VM to determine whether the output of the second VM has diverged from the output of the first VM. In response to a determination that the output of the second VM has diverged from the output of the first VM, a resynchronization of the second VM is executed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.