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:
Dec. 03, 2002
Filed:
Jun. 11, 1999
Yoshihide Kikuchi, Tokyo, JP;
Yuji Kaneko, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
The present invention has as an object thereof to efficiently execute a plurality of I/O commands in a secondary storage device. The tags of the I/O commands which are issued from a data processing device to a secondary storage device comprise the tag A part and the tag B part. The same value is attached as the tag A part to a group of I/O commands which are to be executed in a continuous manner. Values of the tag B parts are provided in order to distinguish I/O commands having the same value of the tag A part. In the secondary storage device, when an I/O command is received from the data processing device, when it is shown by the tag B part that the I/O command is the first command in an I/O command group, or alternatively, when an I/O command having the same tag A part value is not stored in the queue, the I/O command received is added to the final end of the queue. On the other hand, when an I/O command having the same tag A part value is stored in the queue, the I/O command received is inserted after the I/O command group having the same tag A part.