Systems and methods for fault tolerant information processing
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United States of America Patent
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Jan 26, 1999
Issued Date -
N/A
app pub date -
Feb 19, 1997
filing date -
Mar 31, 1995
priority date (Note) -
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Abstract
A fault-tolerant management information system includes three or more data management systems (e.g. data base systems) that replicate data. Data access requests resulting from user requests to application systems are issued by user request processing entities and forwarded by interceptors to all the data management systems. Responses from the data management systems are obtained, and a maximum group of identical responses provides the correct response, even in the case of 'soft' errors not flagged by error codes. Errors are reported to an administration system, and correction of the data base containing the errors is handled by a recovery server. Overall system performance is further enhanced by including data base query systems, which replicate the data. Data access requests resulting from data base query requests are issued by query systems to the data base query systems.
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