Remote copy system maintaining consistency
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United States of America Patent
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Mar 27, 2007
Grant Date -
Jan 12, 2006
app pub date -
Sep 2, 2004
filing date -
Jul 7, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
To provide a remote copy system including: a plurality of primary storage systems and a plurality of secondary storage systems; each of the secondary storage systems including a secondary logical volume that stores a copy of the data stored in a primary logical volume of the primary storage system; a pre-update data storage part that stores pre-update data that is stored before data to be stored in the secondary logical volume is updated and time stamps of the data to be stored in the secondary logical volume; pre-update data prior to a recovery time set based on the time stamps stored in the pre-update data storage part is obtained from the pre-update data storage part; and the pre-update data is written to the secondary logical volume in an inverse order of the time stamp with the latest time stamp first, to recover data of the secondary logical volume.
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