Storage subsystem and its data processing method for reducing the amount of data to be stored in nonvolatile memory
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United States of America Patent
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Apr 14, 2015
Grant Date -
May 23, 2013
app pub date -
Jan 17, 2013
filing date -
Aug 20, 2009
priority date (Note) -
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Abstract
The amount of data to be stored in a semiconductor nonvolatile memory can be reduced and overhead associated with data processing can be reduced. When a microprocessor receives a write request from a host computer and data D1 to D3 exist in a cache slot, the microprocessor reads the LBA of each piece of the data, manages each piece of the data D1 to D3 using a bitmap table by associating them with their LBAs, generates a specific command CMD based on the LBAs of the data D1 to D3, adds the data D1 to D3 and addresses ADD1 to ADD3 indicating where the data D1 to D3 are to be stored, to the specific command CMD, and sends it to an FMPK. The FMPK stores each piece of update data in a specified block in the flash memory based on the specific command CMD.
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