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:
Jul. 10, 2001
Filed:
Dec. 09, 1998
Steven R. McDowell, Lexington, SC (US);
NCR Corporation, Dayton, OH (US);
Abstract
An asynchronous disk mirroring system for use within a network computer system. The disk mirroring system includes a first storage volume connected to receive write requests from the computer system; a write queue connected to also receive the write requests directed to the first storage volume; and a second storage volume connected to the write queue to receive the write requests. The write queue operates to delay the time of receipt of the write requests by the second storage volume. Write requests are passed through the write queue, comprising a plurality of serially connected write buffers, in a first-in, first-out (FIFO) order. A log file connected to receive the delayed write requests from the write queue is also included in the disk mirroring system to provide for log-based mirror reconstruction and check-pointing of the mirrored volumes.