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:
May. 23, 2006
Filed:
Sep. 24, 2002
Kevin John Ash, Tucson, AZ (US);
Vernon J. Legvold, Tucson, AZ (US);
Steven Robert Lowe, Tucson, AZ (US);
David Frank Mannenbach, Tucson, AZ (US);
Carol Santich Mellgren, Tucson, AZ (US);
Kenneth Wayne Todd, Tucson, AZ (US);
William Dennis Williams, Tucson, AZ (US);
Kevin John Ash, Tucson, AZ (US);
Vernon J. Legvold, Tucson, AZ (US);
Steven Robert Lowe, Tucson, AZ (US);
David Frank Mannenbach, Tucson, AZ (US);
Carol Santich Mellgren, Tucson, AZ (US);
Kenneth Wayne Todd, Tucson, AZ (US);
William Dennis Williams, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Provided are a method, system, and program for maintaining data in a first cache and second cache, wherein a backup cache maintains a backup copy of data in the first cache, and wherein the first cache is used to cache a first set of data in a storage system and the second cache is used to cache a second set of data in the storage system. An unavailable state of the first cache is detected. In response to detecting the unavailable state, requests to the first set of data are blocked and at least one space in the second cache is allocated for data in the backup cache. Requests to the first set of data are allowed to proceed after the at least one space is allocated in the second cache and before the data in the backup cache is copied to the at least one allocated space in the second cache. The data from the backup cache is copied to the allocated at least one space in the second cache after the requests to the first set of data are allowed to proceed.