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:
Apr. 10, 1990
Filed:
Aug. 31, 1987
Brent C Beardsley, Tucson, AZ (US);
Michael D Canon, San Jose, CA (US);
Malcolm C Easton, San Jose, CA (US);
Michael H Hartung, Tucson, AZ (US);
John H Howard, San Jose, CA (US);
Robert H Vosacek, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A technique is described for performing a fast write operation. A host write request, which would normally be serviced by an immediate physical write to a data storage device, is instead written to cache and nonvolatile storage in the data storage device controller. Then, the controller signals the host that the write operation is complete and does not update the physical data storage device until later. A journal log is also used to provide recovery capability in the event of system failure. This technique provides high performance for the units' operation while assuring integrity by keeping two copies of the write operation until the physical update transpires.