External storage and data recovery method for external storage as well as program
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United States of America Patent
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-
Jul 10, 2007
Grant Date -
Oct 26, 2006
app pub date -
Jun 8, 2006
filing date -
Mar 20, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The data is automatically recovered to a desired arbitrary point in an external storage without imposing a burden on the host computer. An application on a host computer instructs data recovery control processing of a disk control apparatus to set a recovery opportunity. It is possible to register arbitrary plural points as a recoverable point by setting a recovery flag included in journal data. In the case in which data is recovered due to occurrence of a failure or the like, the application requests a list showing recovery opportunities which have already been set. The application designates a point to which data is recovered on the basis of the recovery opportunity list. The disk control apparatus recovers the data to the designated point on the basis of a backup disk and a journal disk.
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