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:
Feb. 12, 2013
Filed:
Apr. 07, 2010
Shuji Kondo, Odawara, JP;
Katsuhiro Okumoto, Odawara, JP;
Shuji Kondo, Odawara, JP;
Katsuhiro Okumoto, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a previous storage apparatus, differential JNLs are reflected in order of the update numbers, to the data volumes thereof. If a first storage apparatus is suspended, it is determined which is newer: the update number which the journal recently reflected in a second storage apparatus or the update number reflected in a third storage apparatus. In the newer storage apparatus having the newer update number, it is determined whether one or more JNLs from the journal having the update number next to the update number which is not determined to be the newer to the journal having the update number determined to be the newer exist, or not. If the result of the determination is positive, from the newer storage apparatus to the previous storage apparatus which is not the newer of the second and the third storage apparatuses, one or more differential JNLs are copied.