Remote copy secondary data copy validation-audit function
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United States of America Patent
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Jan 7, 1997
Grant Date -
N/A
app pub date -
Oct 3, 1994
filing date -
Oct 3, 1994
priority date (Note) -
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Abstract
A data copy validation technique compares primary data to a copy of that data by generating check codes of the data to be validated at both primary and secondary sites in a continuously running remote data shadowing system. The validation session runs concurrently with the data shadowing so as not to disrupt the data shadowing. Each data validation session is assigned a copy start time, for example, a time preceding a time of a consistency group, for defining when the check code for data at the primary should be compared to a check code of the data at the secondary. The check code of the data at the secondary site is taken at a time that is the equivalent logical point-in-time of that data at the primary site even though the respective data contents may be different in real time.
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