Promoting consistent response times in a data storage system having multiple data retrieval mechanisms
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United States of America Patent
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Feb 14, 2017
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N/A
app pub date -
Dec 30, 2014
filing date -
Dec 30, 2014
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Abstract
A data storage system includes a higher level controller, a lower level controller, and a plurality of storage components including a particular storage component. Data is stored within the data storage system utilizing at least one level of striping across the plurality of storage components. Latencies of input/output operations (IOPs) requesting access to the data stored within the data storage system are monitored. In response to determining that a latency of a read IOP requesting read data stored in the particular storage component exceeds a latency threshold and in absence of a data error, the read IOP is serviced by reconstructing the read data from storage components among the plurality of storage components other than the particular storage component. The lower level controller also provides feedback to the higher level controller to cause the higher level controller to reduce IOPs directed to at least the particular storage component.
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