Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
2005-03-25
2009-12-08
Le, Miranda (Department: 2159)
Data processing: database and file management or data structures
Database design
Data structure types
C707S793000, C707S793000, C709S231000
Reexamination Certificate
active
07631021
ABSTRACT:
An embodiment of the invention provides an apparatus that includes a primary node, a secondary node, and an intermediate node. Data is synchronously copied from the primary node to the intermediate node, and data is asynchronously copied from the intermediate node to the secondary node. The data stored in the intermediate node is a subset of the data set that is stored in the primary node. Therefore, an embodiment of the invention advantageously provides a multiple hop data replication method that allows data recovery if disaster occurs at the location of the primary node. Additionally, an embodiment of the invention advantageously provides a tolerable latency value from the time that a client device sends a write request to the primary node to the time that an acknowledgement message is received by the client device.
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Federwisch Michael
Rowe Alan Lawson
Sarma Joydeep
Watanabe Steven
Le Miranda
Netapp, Inc.
Perkins Coie LLP
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