Detecting inadvertent or malicious data corruption in storage subsystems and recovering data
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United States of America Patent
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Nov 20, 2012
Grant Date -
Oct 20, 2011
app pub date -
Apr 20, 2010
filing date -
Apr 20, 2010
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Embodiments of the invention detect inadvertent or malicious data corruption and for recovering data including receiving a query specifying corrupted application data; analyzing transaction logs to find update operations related to the data; determining where the data are stored, by mapping the table data to locations within the file system and mapping the file system locations to volume logical blocks; and analyzing snapshot volume bitmaps to determine if the bitmaps show changes to the table data stored in the volume logical blocks. Changes which are reflected in the bitmaps for the data, but which do not have corresponding entries in the transaction logs are flagged as unauthorized changes. Snapshots of the data, from a time prior to the time at which a flagged snapshot was taken, are identified for use in restoring data to its status prior to the unauthorized change.
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