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:
Apr. 02, 2013
Filed:
Sep. 30, 2010
Wu Chou, Basking Ridge, NJ (US);
Weiping Guo, Hillsborough, NJ (US);
Feng Liu, Hillsborough, NJ (US);
Zhi Qiang Zhao, Bridgewater, NJ (US);
Wu Chou, Basking Ridge, NJ (US);
Weiping Guo, Hillsborough, NJ (US);
Feng Liu, Hillsborough, NJ (US);
Zhi Qiang Zhao, Bridgewater, NJ (US);
Avaya Inc., Basking Ridge, NJ (US);
Abstract
High availability (HA) protection is provided for an executing virtual machine. At a checkpoint in the HA process, the active server suspends the virtual machine; and the active server copies dirty memory pages to a buffer. During the suspension of the virtual machine on the active host server, dirty memory pages are copied to a ring buffer. A copy process copies the dirty pages to a first location in the buffer. At a predetermined benchmark or threshold, a transmission process can begin. The transmission process can read data out of the buffer at a second location to send to the standby host. Both the copy and transmission processes can operate substantially simultaneously on the ring buffer. As such, the ring buffer cannot overflow because the transmission process continues to empty the ring buffer as the copy process continues. This arrangement allows for smaller buffers and prevents buffer overflows.