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. 09, 2018
Filed:
May. 05, 2016
Thomas D Bissett, Shirley, MA (US);
Stephen J Wark, Shrewsbury, MA (US);
Paul a Leveille, Grafton, MA (US);
James D Mccollum, Princeton, MA (US);
Angel L Pagan, Holden, MA (US);
Thomas D Bissett, Shirley, MA (US);
Stephen J Wark, Shrewsbury, MA (US);
Paul A Leveille, Grafton, MA (US);
James D McCollum, Princeton, MA (US);
Angel L Pagan, Holden, MA (US);
Abstract
A fault tolerant computer system having two virtual machines (VMs), each running on a separate host device, is connected over a network to one or more I/O devices. The system operates to monitor the health of one or more operational characteristics associated with each VM, and in the event that the health of both virtual machines dictates that one or the other of the VMs should be downgraded, but the system is not able to determine which VM should be downgraded and there is an imbalance in a monitored system operational characteristic, the system can defer downgrading one VM for a selected period of time during which the operational characteristic that is in imbalance is monitored. If the imbalance is resolved, the downgrade is cancelled, if an operational fault is confirmed prior to the expiration of the deferral period or if the deferral period expires, then one host is downgraded.