System and method for controlling storage devices
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United States of America Patent
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Apr 8, 2008
Grant Date -
Mar 22, 2007
app pub date -
Nov 22, 2005
filing date -
Sep 16, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is constituted so as to enable more effective backup and restoration than in the prior art.Each time a write request is issued from an application 47, a PVOL is updated by writing the data contained in the issued write request to the PVOL 43P. In the snapshot mode, when the write frequency exceeds a frequency threshold value, the mode is switched from the snapshot mode to the journal mode. When in the snapshot mode, a snapshot of the PVOL at this point in time is acquired, either at regular or irregular intervals, for a SVOL 43S, and the snapshot in this SVOL becomes the restoration data. When in the journal mode, a journal comprising the data in a write request is written to a JVOL 43J each time the write request is issued, and a backup, to which is applied the data in a journal written to the JVOL, is acquired when executing restoration.
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