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US 7,117,393 B2Granted
Failover method in a redundant computer system with storage devices
AssigneeHitachi, Ltd.
InventorsTsunehiko Baba, Shinji Fujiwara, Yoshio Suzuki
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AssigneeHitachi, Ltd.
InventorsTsunehiko Baba, Shinji Fujiwara, Yoshio Suzuki
Estimating the term…
A high availability database system, subject to a failure causing data corruption in the active server system, may recover valid data prior to the corruption, and use the protected and recovered data to effect a failover. At the time when a stand-by computer system detects occurrence of a failure, a pair split is done to the data area to protect the data area data of time T0, just before the occurrence of the failure, and another pair split is done to the log area at the time, where the log area is corrupted or a time T3, where the failover is to take effect without corrupting data, to protect the log area containing data at a given time between time T0 and time T3. By using the data and log areas thus protected, the stand-by computer system may take over valid data and log areas to perform a failover.
A failover method in a redundant computer system with a storage disk device connected to an active computer system and a stand-by computer system taking over a process of said active computer system, comprising the steps of:
A method of replication for use in a computer system including an active computer system, a stand-by computer system taking over a process being performed by said active computer system, and a disk drive device connected to said computer systems, said method generating a secondary volume on said disk device to maintain a paired configuration, and said secondary volume being a replica of a primary volume used by said active computer system, said method comprising the steps of:
A method of replication for use in a computer system including an active computer system, a stand-by computer system taking over a process being performed by said active computer system, and a disk drive device connected to said computer systems, said method generating a secondary volume on said disk device to maintain a paired configuration, and said secondary volume being a replica of a primary volume used by said active computer system, said method comprising the steps of:
Dependencies are inferred from the claim text.