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:
Jul. 18, 2006
Filed:
Aug. 06, 2003
Paul Ashmore, Longmont, CO (US);
Michael Huw Francis, Winchester, GB;
Robert Bruce Nicholson, Southsea, GB;
Simon Walsh, Portsmouth, GB;
Paul Ashmore, Longmont, CO (US);
Michael Huw Francis, Winchester, GB;
Robert Bruce Nicholson, Southsea, GB;
Simon Walsh, Portsmouth, GB;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method for data retention in a data cache and a data storage system are provided. The data storage system () includes a storage controller () with a cache () and a data storage means (). The cache () has a first least recently used list () for referencing dirty data which is stored in the cache (), and a second least recently used list () for clean data in the cache (). Dirty data is destaged from the cache () when it reaches the tail of the first least recently used list () and clean data is purged from the cache () when it reaches the tail of the second least recently used list ().