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:
Dec. 20, 2011
Filed:
Jun. 20, 2007
Qun Fan, Northborough, MA (US);
Stephen R. Ives, West Boylston, MA (US);
Ran Margalit, Swarthmore, PA (US);
Michael J. Scharland, Franklin, MA (US);
Zvi Gabriel Benhanokh, Brookline, MA (US);
Rong Yu, Franklin, MA (US);
Qun Fan, Northborough, MA (US);
Stephen R. Ives, West Boylston, MA (US);
Ran Margalit, Swarthmore, PA (US);
Michael J. Scharland, Franklin, MA (US);
Zvi Gabriel Benhanokh, Brookline, MA (US);
Rong Yu, Franklin, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
Described are techniques for representing and using RAID group consistency information. RAID group consistency information for a slice of data included on a device may be obtained by mapping the slice to an index. The index is one of a plurality of indices each associated with a structure indicating RAID group inconsistencies for a different portion of slices of data of the device. If the index is not associated with a structure, it may be determined that there is no RAID group inconsistency for the slice. If the index is associated with a structure, a hint bit associated with the slice may be determined wherein the hint bit encodes summary consistency information for a plurality of slices. A determination is made as to whether the hint bit is set, and, if the hint bit is not set, it is determined that there is no RAID group inconsistency for the slice.