The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 04, 2016
Filed:
May. 15, 2012
Ganesh Venkitachalam, Mountain View, CA (US);
Rohit Jain, Mountain View, CA (US);
Boris Weissman, Palo Alto, CA (US);
Daniel J. Scales, Mountain View, CA (US);
Vyacheslav Malyugin, Los Gatos, CA (US);
Jeffrey W. Sheldon, Mountain View, CA (US);
Min Xu, Palo Alto, CA (US);
Ganesh Venkitachalam, Mountain View, CA (US);
Rohit Jain, Mountain View, CA (US);
Boris Weissman, Palo Alto, CA (US);
Daniel J. Scales, Mountain View, CA (US);
Vyacheslav Malyugin, Los Gatos, CA (US);
Jeffrey W. Sheldon, Mountain View, CA (US);
Min Xu, Palo Alto, CA (US);
VMware, Inc., Palo Alto, CA (US);
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.