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:
Jan. 31, 2012
Filed:
Jan. 03, 2008
Koji Nagata, Kaisei, JP;
Masaaki Kobayashi, Odawara, JP;
Koji Nagata, Kaisei, JP;
Masaaki Kobayashi, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention aims at providing a storage apparatus that does not increase the I/O load on a primary volume, even if there are several secondary volumes for which data consistency with the primary volume should be guaranteed. A storage apparatus writes write data for write access directed to a primary volume P to a secondary volume S. A controller in the storage apparatus copies that write data from the secondary volume Sto secondary volumes. Sand Sin background processing. The storage apparatus uses bitmaps to manage data in the secondary volume Sshared by each of the secondary volumes Sand S