Apparatus and method for data replication at an intermediate node
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United States of America Patent
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Dec 8, 2009
Grant Date -
Sep 28, 2006
app pub date -
Mar 25, 2005
filing date -
Mar 25, 2005
priority date (Note) -
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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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