Method of verifying data consistency between local and remote mirrored data storage systems
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United States of America Patent
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Nov 12, 2002
Issued Date -
N/A
app pub date -
Jun 7, 2001
filing date -
May 17, 2000
priority date (Note) -
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Abstract
Data consistency is verified between geographically separated and connected active and mirroring data processing systems by creating metadata which describes user data, such as a cyclical redundancy code (CRC), and time stamp information which describes the time at which user data was first stored on the active system. The metadata and the time stamp information sent from the active system is compared at the mirroring system with the time stamp information and metadata read from the mirroring system. Upon detecting a discrepancy when comparing the metadata from the active and mirroring systems, the user data from the active or mirroring system which is less current temporally, as determined by the time stamp information, is replaced by the user data from the other one of the active or mirroring systems having the more current temporal time stamp information.
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