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|United States Patent||6,360,331|
|Vert , et al.||March 19, 2002|
A method and system for transparently failing over a legacy application from a first system to a second system of a server cluster by tracking and checkpointing changes to application configuration information stored in a system's local registry. When an application running on the first system makes a change to the application configuration information in a subtree of the registry, the change is detected and a snapshot of the subtree's data is taken. The snapshot is written to a storage device shared by systems of the cluster, such as a quorum disk. When the application is failed over to a second system, the snapshot for that application is retrieved from the quorum disk and written to the registry of the second system in a corresponding subtree. The application is then run on the second system using the most-recent application configuration information as modified by the other system in the cluster.
|Inventors:||Vert; John D. (Seattle, WA), Shrivastava; Sunita (Redmond, WA)|
|Filed:||April 17, 1998|
|Current U.S. Class:||714/4 ; 709/239; 709/249; 714/14; 714/57|
|Current International Class:||H04L 1/22 (20060101); H02H 003/05 ()|
|Field of Search:||714/4,14,13,10,57 709/223,224,200,201,249,239|
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