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:
Jan. 10, 2012
Filed:
Aug. 31, 2009
Guido Westenberg, Columbia Heights, MN (US);
Joshua Kruck, St. Paul, MN (US);
Guido Westenberg, Columbia Heights, MN (US);
Joshua Kruck, St. Paul, MN (US);
Symantec Corporation, Mountain View, CA (US);
Abstract
Techniques are disclosed relating to storing a log of write operations made to a first storage device by one of a plurality of host computers running an instance of a distributed application. The log of write operations is stored at a second storage device. The plurality of host computers communicate status information to the second storage device over respective communication paths. Upon a failure to communicate status information between one of the host computers and the second storage device, the second storage device reads from a predetermined location in the first storage device to determine whether the host computer is still performing write operations. If the second storage device reads an expected signature value written by the host computer, the host computer is deemed to have written data, which indicates that the host computer is operational but that the write operations have not been recorded by the second storage device.