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:
Oct. 26, 2010
Filed:
Nov. 08, 2006
Richard G. Chandler, West Hartford, CT (US);
Stephen A. Fridella, Newton, MA (US);
Sorin Faibish, Newton, MA (US);
Uday K. Gupta, Westford, MA (US);
Xiaoye Jiang, Shrewsbury, MA (US);
Richard G. Chandler, West Hartford, CT (US);
Stephen A. Fridella, Newton, MA (US);
Sorin Faibish, Newton, MA (US);
Uday K. Gupta, Westford, MA (US);
Xiaoye Jiang, Shrewsbury, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
A read-write access to a file in a file server includes an initial metadata access step, an asynchronous read or write of file data, and a metadata commit step. In order to parallelize access to a range locking database, an inode and indirect file block mapping database, and a pre-allocation data base, operations are pipelined within the metadata access step and also within the metadata commit step. The pipelined operations within the metadata access step include a first stage of range locking, a second stage of reading block mapping metadata, and a third stage of reading and updating a pre-allocation map for write access. The pipelined operations within the metadata commit step include a first stage of releasing range locks, a second stage of accessing old block metadata for write access, and a third stage of updating metadata and flushing the pre-allocation map for write access.