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. 05, 2009
Filed:
Jan. 07, 2005
Suguang LI, Tucson, AZ (US);
David F. Mannenbach, Tucson, AZ (US);
Karl A. Nielsen, Tucson, AZ (US);
Richard B. Stelmach, Tucson, AZ (US);
Suguang Li, Tucson, AZ (US);
David F. Mannenbach, Tucson, AZ (US);
Karl A. Nielsen, Tucson, AZ (US);
Richard B. Stelmach, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A bad track in a disk device in a data storage system is recovered by determining which cluster in the system the bad track belongs to. If the track belongs to the cluster that discovered that the track was bad, that cluster recovers the track by locating a good copy of the track, staging the good copy of the track to cache, and destaging the good copy of the track storage unit from the cache to all copies of the track, whether good or bad, in the data storage system. If the track belongs to another cluster, the cluster that discovered that the track was bad sends a message to the other cluster to inform it of the bad track, and the other cluster recovers the bad track. In another aspect, all tracks are owned by one server or server cluster, which performs the staging and destaging.