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:
Jun. 18, 1996
Filed:
Dec. 22, 1992
Brent C Beardsley, Tucson, AZ (US);
Michael T Benhase, Tucson, AZ (US);
Susan K Candelaria, Tucson, AZ (US);
Joel H Cord, Tucson, AZ (US);
Michael H Hartung, Tucson, AZ (US);
Bruce M Henry, Los Gatos, CA (US);
Paul Hodges, San Jose, CA (US);
Paul L Leung, Tucson, AZ (US);
Robert W Shomler, Morgan Hill, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Often in DASD subsystems, circumstances can occur which prevent the full transfer of the required data from channel to subsystem during a write operation. The disclosed methods prevents this data from later being read and treated as valid data by the host processor. This is achieved by marking data as invalid within the storage subsystem once it is determined that a channel error has occured. Subsequently, upon reading that data, the host processor can be made aware of the data invalidity and treat the data accordingly. In a second embodiment, invalid data is discarded rather than stored over the previous valid version of the data, before it is ever stored on DASD.