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. 05, 1995
Filed:
Feb. 16, 1993
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides a non-stop data processing system having an online data backup function. The method according to the present invention is a data backup method for a computer system having a central processing unit for performing multitask processing, a multiple memory constituted by a plurality of memory devices for online storing data processed by tasks of the central processing unit, and a data backup memory for saving data of the multiple memory, wherein the central processing unit performs parallel processing of (a) user task(s) to treat usual work between the central processing unit and the multiple memory and a maintenance task to save data online from memory devices as a part of the multiple memory to the data backup memory. A data processing system according to the present invention is a data processing system having a central processing unit for performing multitask processing, a multiple memory constituted by a plurality of memory devices for storing data currently processed, and a data backup memory for saving data of the multiple memory, wherein: the central processing unit has (a) user task(s) to write currently processed data into the multiple memory, and a maintenance task to stop updating of memory devices as a part of the multiple memory and save data to the data backup memory; and the system further has an online interface whereby access to the respective memory devices of the multiple memory by the user task(s) and the maintenance task is relayed online.