Server duplexing method and duplexed server system
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United States of America Patent
Stats
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Mar 4, 2008
Grant Date -
Sep 11, 2003
app pub date -
Jan 31, 2002
filing date -
Mar 26, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of duplicating servers and a duplicated server system that make seamless transition of service in case of server failures possible. The duplicated server system comprises first and second servers that are connected to a network and have the same network address, communication means for making high-speed communication between both servers possible, and switchover controller that designates the first server as the primary server put in operation for other computers and the second server as the secondary server in normal condition. When the first server receives a service request addressed to the system, it passes the service request to the application for processing. The first server sends the recovery data output by the application to the second server by means of the communication means. If the processing related to the service request involves an update of the data held on the server system, the second server executes the application using the recovery data sent from the first server to keep the data held on both servers identical. Service requests and the results of the processing are stored in the stacks in both servers in duplicate.
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