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:
May. 08, 2007
Filed:
Jan. 28, 2004
Naohisa Kasako, Odawara, JP;
Naohisa Kasako, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
It is an object of the present invention to conduct data transfer or data copying between a plurality of storage systems, without affecting the host computer of the storage systems. Two or more auxiliary storage systemsB,C are connected to a primary storage systemA connected to a host device. The auxiliary storage systemsB,C read journals of data update from the primary storage systemA at respective independent timings, save the journals in prescribed logical volumes JNL, JNL, produce copying of the data present in the primary storage systemA based on the journals present in the logical volumes JNL, JNLat the independent timings, and save the copies in auxiliary logical volumes COPY, COPY. The primary storage systemA holds the journals till both auxiliary storage systemsB,C read the journals and restore. The timing of journal read can be controlled according to the journal quantity, processing load, and the like.