Adjusting timestamps to preserve update timing information for cached data objects

US6842825B2 · kind B2 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Robert V. Geiner · Poughkeepsie, US
• Ronald Maynard Kern · Tucson, US
• Gregory E. McBride · Vail, US
• William Frank Micka · Tucson, US
• Jeffrey M. Nick · West Park, US
• Larry R. Perry · Gilroy, US
• David B. Petersen · Great Falls, US
• David Michael Shackelford · Tucson, US
• Harold Glen Slone · Los Gatos, US
• Harry M. Yudenfriend · Poughkeepsie, US
• Douglas M. Zobre · Poughkeepsie, US

Key dates

• Filing date: Aug 7, 2002
• Grant date: Jan 11, 2005
• Expiry date: Jun 10, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S707/99953
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

In a system including a host, a primary storage subsystem coupled to the host, a cache coupled to the host and separate from the primary storage system, a secondary storage subsystem, and a data mover coupling the primary and secondary storage systems, data is temporarily cached for future storage in the primary storage subsystem so as to preserve timestamp information and maintain data consistency for asynchronously mirroring the data at a secondary subsystem.