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. 14, 1999
Filed:
Sep. 29, 1997
John K Walton, Mendon, MA (US);
Eli Leshem, Brookline, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
A system and method for reconstructing data, and/or generating a parity bit for use in reconstructing data, in a data storage system having a set of disk drives and an associated redundant disk drive. The system includes a memory having an exclusive OR gate to provide an accumulated exclusive ORing of the data successively coupled thereto. The accumulated exclusive OR result is coupled to the redundant disk drive in generating the parity bit or to a replaced disk drive when reconstructing data. The system includes: a bus; a controller coupled between the bus and the disk drives; an addressable memory coupled to the bus. The memory includes: a write buffer memory having an input coupled to the bus; a read buffer memory having an output coupled to the bus; and, the exclusive OR logic unit having a pair of inputs. One input is coupled to an output of the write buffer memory and another input is coupled to the output of the read buffer memory. The exclusive OR logic unit produces at the output thereof an exclusive OR logic function between data at the pair of inputs of such logic unit. A random access memory is coupled to an output of the logic unit.