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:
Nov. 28, 2000
Filed:
Mar. 26, 1997
Ishai Kedem, Brookline, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
A method of dynamically changing a storage system from a RAID configuration to a mirror configuration is provided. The change occurs when a device begins to fail or fails completely. Data from the logical volumes of the failed device is written to corresponding parity volumes within the RAID group. In addition, data from all logical data volumes is copied to spare devices. Once all the data is copied, the system operates in a mirrored mode. A mirrored mode includes writing data to both and active and backup volume for each write transaction. When the failed device is replaced the data and parity volumes are restored. Once restored, the spare devices are returned to inactive status.