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:
Jul. 06, 2010
Filed:
Dec. 12, 2006
Robert L. Fair, Cary, NC (US);
Eric Hamilton, Durham, NC (US);
Jeffrey S. Kimmel, Chapel Hill, NC (US);
Robert L. Fair, Cary, NC (US);
Eric Hamilton, Durham, NC (US);
Jeffrey S. Kimmel, Chapel Hill, NC (US);
Network Appliance, Inc., Sunnyvale, CA (US);
Abstract
A network storage filer implements a four-phase commit protocol to coordinate consistency points among a group of volumes (a 'group consistency point') such that, upon recovery, all volumes of the group reflect consistency points taken at the same time. The filer records progress at each phase while creating the consistency points of the volumes. Upon recovery, the same or a different filer uses the last recorded progress indicator to ascertain whether the consistency points were completed on all of the volumes in the group. If all the volume consistency points of the group consistency point were completed, the filer users the volume consistency points to mount the volumes. Otherwise, the filer uses an earlier group consistency point to mount the volumes. In either ease, the volumes are consistent with each other.