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:
Aug. 26, 2008
Filed:
Oct. 04, 2004
Masaya Ichikawa, Sagamihara, JP;
Yuzuru Maya, Sagamihara, JP;
Hideaki Sampei, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Consistency of a shared disk is secured in system switching in a hot standby system. In the standby system in which an active computer and standby computer share the shared disk, when a write I/O request is issued from the active computer, information about a start of the I/O is recorded in, for example, a memory. When the I/O is completed, the information is deleted from the memory. When a failure occurs in the active computer, the active computer transmits the record of the information about the start of the I/O, to the standby computer. The standby computer verifies the record to recover a disk in which the I/O is to be executed.