Mirroring device, control method thereof, and storage medium that maintain difference in remaining writable amounts of data
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United States of America Patent
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Oct 3, 2017
Issued Date -
N/A
app pub date -
Dec 18, 2014
filing date -
Jan 6, 2014
priority date (Note) -
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Abstract
A mirroring device that can improve, even when two storage devices to which an upper limit is set for the number of rewrites of data are used, the fault tolerance of the mirroring device while preventing one of the storage devices from reaching the lifetime thereof early. A mirroring device comprises two storage devices to which an upper limit is set for the number of rewrites of data. Remaining writable amounts of the data in the storage devices are acquired respectively from total amounts of the data written in the respective storage devices. When it is determined that a difference between the respective acquired remaining writable amounts is less than a predetermined value, the respective storage devices are controlled such that the difference becomes equal to or more than the predetermined value.
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