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:
Sep. 01, 2009
Filed:
Apr. 13, 2004
Luis Felipe Cabrera, Bellevue, WA (US);
Catharine Van Ingen, Berkeley, CA (US);
Norbert P. Kusters, Woodinville, WA (US);
Rod N. Gamache, Issaquah, WA (US);
Luis Felipe Cabrera, Bellevue, WA (US);
Catharine van Ingen, Berkeley, CA (US);
Norbert P. Kusters, Woodinville, WA (US);
Rod N. Gamache, Issaquah, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
Volume configuration data management systems and methods are described. A logical volume provider maintains an epoch number on each of the extents comprising a volume. Upon each change in the configuration of the volume, the epoch number on each of the currently online extents is updated. When a volume is discovered and a request is made to bring the volume online, the logical volume provider can compare the epoch numbers on the extents to determine if the volume data is consistent across each of the extents, or if an extent contains stale data due to a transitory outage.