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. 29, 2009
Filed:
May. 19, 2005
Satoru Watanabe, Kokubunji, JP;
Yoshio Suzuki, Kokubunji, JP;
Shinji Fujiwara, Sagamihara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Provided is a backup method including a step (S) of reading a log which is a data update difference, and identifying a data storage area (page) of backup data, a step (S) of determining high/low reusability of the identified data storage area, a step (S) of storing a log corresponding to a data storage area determined to be low in reusability in a log storage area preset on a memory, and a step (S) of applying a log corresponding to a data storage area determined to be high in reusability to the identified data storage area in a cache area set on the memory, and updating the data storage area. Thus, by further reducing the number of I/O times in an external storage system of a standby system which backs up data by log transfer, it is possible to reduce introduction costs of a backup system and its normal-time operation's costs at normal times.