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. 09, 2013
Filed:
Feb. 24, 2010
Wu Chou, Basking Ridge, NJ (US);
Weiping Guo, Piscataway, NJ (US);
Vivekananda Velamala, Thornton, CO (US);
Zhi Qiang Zhao, Bridgewater, NJ (US);
Wu Chou, Basking Ridge, NJ (US);
Weiping Guo, Piscataway, NJ (US);
Vivekananda Velamala, Thornton, CO (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. A standby server provides a disk buffer that stores disk writes associated with a virtual machine executing on an active server. At a checkpoint in the HA process, the active server suspends the virtual machine; the standby server creates a checkpoint barrier at the last disk write received in the disk buffer; and the active server copies dirty memory pages to a buffer. After the completion of these steps, the active server resumes execution of the virtual machine; the buffered dirty memory pages are sent to and stored by the standby server. Then, the standby server flushes the disk writes up to the checkpoint barrier into disk storage and writes newly received disk writes into the disk buffer after the checkpoint barrier.