Maintaining consistency when mirroring data using different copy technologies

US7552295B2 · kind B2 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Robert Frederic Kern · Tucson, US
• Kenneth Wayne Boyd · Tucson, US
• Gregory E. McBride · Vail, US
• Gail A. Spear · Tucson, US
• Robert Francis Bartfai · Tucson, US
• William Frank Micka · Tucson, US
• Kenneth Fairclough Day, III · Tucson, US

Key dates

• Filing date: Jan 3, 2006
• Grant date: Jun 23, 2009
• Expiry date: Jul 13, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F11/2071
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

Provided are a method, system, and program for maintaining consistency when mirroring data using different copy technologies. Update groups having updates to primary storage locations are formed using a first copy technology. The updates in the update groups are copied to secondary storage locations. Update groups having updates to primary storage locations are formed using a second copy technology, wherein the updates in the update groups are copied to secondary storage locations. Indication is made in a data structure of a time of an update in response to including the update in one of the update groups formed using the first copy technology. Indication is also made in the data structure of a time of the update group formed using the second copy technology.