Computer system capable of fast failover upon failure

Details Computer system capable of fast failover upon failure Computer system capable of fast failover upon failure

2006-08-29

2006-08-29

Bonzo, Bryce P. (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

Reexamination Certificate

active

07100070

ABSTRACT:
To provide a computer system capable of fast failover so that a service is stopped only for a brief period of time from a failure in a first site. The computer system includes a primary site for regular operation and a secondary site that operating when the primary site fails. A primary storage and a secondary storage have a synchronization unit to make contents stored in the primary storage and contents stored in the secondary storage identical to each other. A client has a cache for recording address information (e.g. DNS) that gives the client an access to the server from which the service is provided and information that defines a time to live of the address information. A first server has a primary request log processing unit, which instructs the client to shorten the recorded time to live of the address information when communication with the secondary site is detected to be impossible.

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