System and method for restoring data on demand for instant volume restoration
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United States of America Patent
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Oct 5, 2010
Grant Date -
May 31, 2007
app pub date -
Apr 24, 2006
filing date -
Feb 10, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A technique is disclosed for restoring data of sparse volumes, where one or more block pointers within the file system structure are marked as ABSENT, and fetching the appropriate data from an alternate location on demand. Client data access requests to the local storage system initiate a restoration of the data from a backing store as required. A demand generator can also be used to restore the data as a background process by walking through the sparse volume and restoring the data of absent blocks. A pump module is also disclosed to regulate the access of the demand generator. Once all the data has been restored, the volume contains all data locally, and is no longer a sparse volume.
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