Tiered storage system, storage controller and data location estimation method
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United States of America Patent
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Oct 9, 2018
Grant Date -
Nov 24, 2016
app pub date -
Aug 4, 2016
filing date -
Jul 31, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
According to one embodiment, a tiered storage system includes first and second storage devices having access speeds different from each other, and a storage controller. The storage controller manages first and second access frequency statistical values. The first access frequency statistical value corresponds to a state in which data of a respective one of logical chunks is located on the first storage device, and the second access frequency statistical value corresponds to a state in which data of the respective one is located on the second storage device. The storage controller determines whether it is necessary to change the location state of the data of the respective one, based on the first and second access frequency statistical values of the respective logical chunks.
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