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4913 results about "Data synchronization" patented technology

Data synchronization is the process of establishing consistency among data from a source to a target data storage and vice versa and the continuous harmonization of the data over time. It is fundamental to a wide variety of applications, including file synchronization and mobile device synchronization e.g., for PDAs. Synchronization can also be useful in encryption for synchronizing Public Key Servers.

Method, system and article of manufacture for recovery from a failure in a cascading PPRC system

InactiveUS20050081091A1Application downtime is minimizedRedundant hardware error correctionData synchronizationControl store
A method of recovery from a data storage system failure in a data storage system having a host computer writing data to a first storage unit with a first storage controller synchronously mirroring the data to a second storage unit, and with a second storage controller asynchronously mirroring the data to a third storage unit. The method begins with the detection of a failure associated with the first storage unit. Upon detection of the error or failure associated with the first storage unit, the synchronous data mirroring relationship between the first storage unit and the second storage unit is terminated and the host is directed to write data updates directly to the second storage unit. Upon correction of the failure associated with the first storage unit, the asynchronous mirroring of data updates from the second storage unit to the third storage unit is suspended and synchronous mirroring of the data updates in a reverse direction, from the second storage unit to the first storage unit, is commenced. When a full duplex state is reached between the first storage unit and the second storage unit, the synchronous PPRC relationship with the first storage volume mirroring data to the second storage volume may be reestablished and host I/O writes to the first storage unit may be resumed.
Owner:IBM CORP

Data synchronization between distributed computers

Apparatus, method and program for maintaining common data in first, second and third datasets in first, second and third respective computer systems. The first computer system is assigned a sole right to approve updates of the common data while able, and a second computer system is assigned a right to approve updates of the common data when the first computer system is unable. The third computer system subsequently makes a request to the first computer system to update the common data, and in response, the first computer system updates the common data in the first dataset and advises the second and third computer systems to make a corresponding update to their second and third datasets, respectively. The third computer system makes a subsequent request to the first computer system to update the common data, and in response, the third computer system learns that the first computer system is unable to approve updates of the common data and determines that the second computer system has a right to approve updates of the common data when the first computer system is unable to approve updates of the common data. In response, the third computer system makes a request to the second computer system to update the common data and notify the second computer system that the first computer system is unable to approve updates of the common data. The second computer system updates the common data in the second dataset and advises the third computer system to make a corresponding update to the third dataset.
Owner:IBM CORP
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