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:
Mar. 16, 2010
Filed:
Feb. 20, 2007
Kevin John Ash, Tucson, AZ (US);
Lokesh Mohan Gupta, Tucson, AZ (US);
Steven Robert Lowe, Tucson, AZ (US);
Alfred Emilio Sanchez, Tucson, AZ (US);
Kenneth Wayne Todd, Tucson, AZ (US);
Kevin John Ash, Tucson, AZ (US);
Lokesh Mohan Gupta, Tucson, AZ (US);
Steven Robert Lowe, Tucson, AZ (US);
Alfred Emilio Sanchez, Tucson, AZ (US);
Kenneth Wayne Todd, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
In a data storage subsystem with disk storage and a pair of clusters, one set of DASD fast write data is in cache of one cluster and in non-volatile data storage of the other. In response to a failover of one of the pair of clusters to a local cluster, the local cluster converts the DASD fast write data in local cache to converted fast write data to prioritize the converted data for destaging to disk storage. In response to failure to destage, the local cluster allocates local non-volatile storage tracks and emulates a host adapter to store the converted fast write data by the local non-volatile storage, reconverting the converted fast write data of the non-volatile storage to local DASD fast write data stored in the local non-volatile storage and stored in the local cache storage.