Storage System and Control Method Thereof
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United States of America Patent
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Issued Date -
May 28, 2015
app pub date -
Aug 4, 2014
filing date -
Nov 26, 2013
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Abstract
A storage system has a plurality of physical blocks, a buffer and a controller. In response to an unmap command received from an operating machine, the controller moves a mapping between a physical block and a logical block of the storage system to a buffer to prepare a deallocation procedure. Then, the controller transmits a completion response to the operating machine. The unmap command is used to cancel the mapping, the completion response is used to notify the operating machine that execution of the unmap command has been finished, and the deallocation procedure is used to deallocate the physical block according to the mapping in the buffer. After the completion response has been transmitted to the operating machine, the controller deallocates the physical block according to workload of the storage system.
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