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:
Nov. 20, 2001
Filed:
Aug. 17, 1999
Koji Ozawa, Odawara, JP;
Kazuhide Sano, Odawara, JP;
Takeshi Koide, Odawara, JP;
Katsunori Nakamura, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a data processing system in which main and sub disk storage devices are under the control of individual each disk control devices, the write processing time is reduced by selectively sending data according to the command-chaining time between main and sub disk control devices. A section for judging cable length and function of the sub disk control device,estimates command-chaining time between a pair of main and sub disk storage devices. The channel command analyzing section,estimates the number of records to be transferred and the length of a record using a LOCATE RECORD command. The command judgment section for the sub disk control device,optimizes the command-chain to be issued to the sub disk control device using the above-mentioned information. Then, the section for issuing command to the sub disk control device,issues the optimized command chain. Thus, a shorter transmission time is realized by either sending individual records or an entire track of data.