Method and system for taking a data snapshot
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United States of America Patent
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Issued Date -
Jan 13, 2005
app pub date -
Jul 8, 2003
filing date -
Jul 8, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method and system for creating a snapshot of data. The snapshot system creates a snapshot of data that is hierarchically organized, such as the data of a file system. When a snapshot is to be created, the snapshot system copies the root node of the hierarchical organization to a new root node that points to the same child nodes as the copied root node. This new root node becomes the root node of the snapshot data. When a current node is subsequently modified, the snapshot system replaces each ancestor node of that node that has not yet been replaced with a new node that has the same child nodes as the replaced node. The snapshot system also replaces the node to be modified with a new node that points to the same child nodes of the replaced node.
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