Method and system for achieving high availability in networked c

Details Method and system for achieving high availability in networked c Method and system for achieving high availability in networked c

1997-03-31

1999-08-24

Cabeca, John W.

Error detection/correction and fault detection/recovery

Pulse or data error handling

Transmission facility testing

711100, 711156, 3642453, 3642853, G06F 1100

Patent

active

059419997

ABSTRACT:
The present invention provides a method and system for achieving high availability in networked computer systems. The computer system includes a client node, two server nodes, and a secondary storage device. One server node includes a primary replica, and the other server node includes a secondary replica. In order for the client node to request a service that involves the secondary storage device, the client node sends a request for the service to the primary replica. The primary replica performs an intention phase of the service and sends a checkpoint message to the secondary replica. The secondary replica updates the state of the secondary replica and sends an acknowledgement message to the primary replica. The primary replica performs the service, sends a reply message to the client node, and forgets about the request. The client node resumes execution and asynchronously sends a forget message to the secondary replica. Upon receiving the forget message, the secondary replica forgets about the request.

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