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. 12, 2002
Filed:
Dec. 13, 1999
Joseph Paul Hughes, Boulder, CO (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
The present invention ensures system configuration data structure coherency across multiple controllers in a data storage system. To accomplish this, a controller that detects any change in the system configuration of the data storage system, must first reserve a predetermined device before it can modify its own system configuration data structure, and before it can notify any other controllers of the change, such that they can modify their respective system configuration data structures. After such modifications the detecting controller will release the reservation of the predetermined device. In this manner, updates to each respective controller's system configuration data structure are synchronized, ensuring system configuration data structure coherency across multiple controllers in the data storage system.