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:
Sep. 06, 1983
Filed:
Sep. 28, 1981
John H Christian, Tucson, AZ (US);
Arthur H Nolta, Tucson, AZ (US);
David G Reed, Tucson, AZ (US);
Richard E Rieck, Tucson, AZ (US);
Gerald E Tayler, Tucson, AZ (US);
Terrell N Truan, Tucson, AZ (US);
John S Williams, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Direct access storage devices (DASD) are connected to a host via a cache. Each device can be independently addressed by any one of a plurality of addresses, also termed logical devices and exposures. Since operations between DASD and cache are combined for all of the independent logical devices, resetting operations related to one independent logical device can inadvertently interfere with operations of another independent logical device. To maintain data integrity, a programmed control accommodates logical device independence by using queues and control blocks relating to the DASD and logical devices, respectively.