Tiered storage system, storage controller, and tiering control method
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United States of America Patent
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Feb 13, 2018
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N/A
app pub date -
Jul 11, 2016
filing date -
Mar 16, 2016
priority date (Note) -
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Abstract
According to one embodiment, a tiered storage system includes a first storage device, a second storage device and a storage controller. The first and second storage devices are positioned as an upper tier and a lower tier, respectively. The storage controller transfers data of q physical extents in the second storage device to q free physical extents in the first storage device, when an access request from a host computer designates access to one or more logical blocks including a first logical block, the first logical block is included in a first logical extent, and the first logical extent belongs to an extent group including q logical extents to which the q physical extents are allocated.
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