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FLASH STORAGE DEVICE WITH READ CACHE

  • US 20120239854A1
  • Filed: 05/12/2010
  • Published: 09/20/2012
  • Est. Priority Date: 05/12/2009
  • Status: Active Grant
First Claim
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1. A method of managing a flash storage device, the method comprising:

  • storing, in a first memory, copies of data read from a flash memory in the flash storage device;

    mapping a logical address in a read request received from a host system to a virtual unit address and a virtual page address;

    checking a virtual unit cache tag table in the first memory based on the virtual unit address;

    if a hit is found in the virtual unit cache tag table, checking a virtual page cache tag sub-table in the first memory based on the virtual page address, wherein the virtual page cache tag sub-table is associated with the virtual unit address;

    if a hit is found in the virtual page cache tag sub-table, reading data stored in the first memory mapped to the hit in the virtual page cache tag sub-table in response to the read request received from the host system.

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