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NetApp Assigned Patent

Identifying and eliminating duplicate and sharing data blocks in storage system

NetApp, Inc., Sunnyvale, CA, has been assigned a patent (8,849,767) developed by five co-inventors for a “method and apparatus for identifying and eliminating duplicate data blocks and sharing data blocks in a storage system.”

The co-inventors are Ling Zheng, Sunnyvale, CA, Blake H. Lewis, Los Altos Hills, CA, Daniel W. Ting, Palo Alto, CA, Robert M. English, Menlo Park, CA, and Stephen L. Manley, Pleasanton, CA.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A method for sharing data blocks in a hierarchical file system in a storage server includes allocating a plurality of data blocks in the file system, and sharing data blocks in the file system, without using a persistent point-in-time image, to avoid duplication of data blocks. A method for identifying data blocks that can be shared includes computing a fingerprint for each of multiple data blocks to be written to a storage facility and storing the fingerprint with information identifying the data block in an entry in a set of metadata. The set of metadata is used to identify data blocks which are duplicates.”

The patent application was filed on April 13, 2005 (11/105,895).

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