Storage unit and storage system that suppress performance degradation of the storage unit
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United States of America Patent
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Oct 29, 2019
Grant Date -
Jan 11, 2018
app pub date -
Apr 28, 2015
filing date -
Apr 28, 2015
priority date (Note) -
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Abstract
A storage unit according to one aspect of the present invention comprises a storage controller and a plurality of storage devices. Each storage device has nonvolatile semiconductor memories serving as storage media. The controller of each storage device diagnoses the state of degradation of the nonvolatile semiconductor memories, and if one of the nonvolatile semiconductor memories is expected to be nearing end of life, then the controller copies the data stored in that degraded nonvolatile semiconductor memory to another nonvolatile semiconductor memory, and then performs shutdown processing for the degraded nonvolatile semiconductor memory, as well as storage capacity reduction processing.
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