Asynchronous remote copy system and storage control method
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United States of America Patent
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Jan 30, 2018
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N/A
app pub date -
Jan 14, 2013
filing date -
Apr 7, 2010
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Abstract
In a previous storage apparatus, differential JNLs are reflected in order of the sequential numbers, to the data volumes thereof. If a first storage apparatus is suspended, it is determined which is newer: the sequential number which the journal recently reflected in a second storage apparatus or the sequential number reflected in a third storage apparatus. In the newer storage apparatus having the newer sequential number, it is determined whether one or more JNLs from the journal having the sequential number next to the sequential number which is not determined to be the newer to the journal having the sequential number determined to be the newer exist, or not. If the result of the determination is positive, from the newer storage apparatus to the previous storage apparatus which is not the newer of the second and the third storage apparatuses, one or more differential JNLs are copied.
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