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Host device, access system, and access method

  • US 10,191,841 B2
  • Filed: 07/05/2016
  • Issued: 01/29/2019
  • Est. Priority Date: 07/06/2015
  • Status: Active Grant
First Claim
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1. A host device comprising:

  • a storage device storing a physical mapping table;

    a processor checking the physical mapping table according to a first logical block address and a second logical block address of an access operation to find a first physical block address, a second physical block address, a first solid state disk (SSD) identification code, and a second SSD identification code; and

    an interface, coupled to the processor,wherein the processor transmits the first physical block address which is found from the physical mapping table to one of a plurality of SSDs through the interface according to the first SSD identification code to access data at the first physical block address and transmits the second physical block address which is found from the physical mapping table to another one of the plurality of SSDs through the interface according to the second SSD identification code to access a horizontal parity code at the second physical block address,wherein the plurality of SSDs are disposed outside of the processor,wherein the plurality of SSDs form a redundant array of independent disks (RAID), and the RAID stores the data into a first SSD among the plurality of SSDs and further stores the horizontal parity code and a vertical parity code which correspond to the data respectively into a second SSD and a third SSD among the plurality of SSDs, andwherein the processor generates the horizontal parity code and the vertical parity code according to the data and checks or recovers the data according to the horizontal parity code and the vertical parity code.

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