Storage controller, storage device, information processing system, and storage controlling method

A storage device, comprising:

• a unit data storing portion configured to store therein plural pieces of unit data with data and a first error correcting code of the data as unit data;
• an error correcting code storing portion configured to store therein a second error correcting code of predetermined plural pieces of unit data so as to correspond to the predetermined plural pieces of unit data in the plural pieces of unit data;
• an error correcting code managing portion having entries and being configured to manage a correspondence relationship between the predetermined plural pieces of unit data, and the second error correcting code corresponding to the predetermined plural pieces of unit data;
• an address managing portion configured to manage a correspondence relationship between logical addresses and the entries in said error correcting code managing portion;
• and
• an error correcting portion configured to acquire one of the entries in said error correcting code managing portion, corresponding to the logical address as an object of read from said address managing portion, thereby carrying out error correction based on the predetermined plural pieces of unit data managed in the entry concerned, and the second error correcting code.

An information processing system, comprising:

• a unit data storing portion configured to store therein plural pieces of unit data with data and a first error correcting code of the data as a unit;
• an error correcting code storing portion configured to store therein a second error correcting code of predetermined plural pieces of unit data so as to correspond to the predetermined plural pieces of unit data in the plural pieces of unit data;
• an error correcting code managing portion having entries and being configured to manage a correspondence relationship between the predetermined plural pieces of unit data, and the second error correcting code corresponding to the predetermined plural pieces of unit data;
• an address managing portion configured to manage a correspondence relationship between logical addresses and the entries in said error correcting code managing portion;
• an error correcting portion configured to acquire one of the entries in said error correcting code managing portion, corresponding to the logical address as an object of read from said address managing portion, thereby carrying out error correction based on the predetermined plural pieces of unit data managed in the entry concerned, and the second error correcting code;
• and
• a host computer configured to issue a request to request an access to said unit data storing portion.

A storage controller, comprising:

• an address managing portion configured to manage a correspondence relationship between logical addresses and physical addresses in a first or third storage area of a memory with respect to plural pieces of data when the plural pieces of data and an error correcting code corresponding to the plural pieces of data are stored in said first storage area of said memory, the error correction code is stored in a second storage area of said memory so as to correspond to each predetermined number of the plural pieces of data, and appendant data for any one of the plural pieces of data, and an error correcting code for the appendant data are stored in said third storage area of said memory;
• a control portion configured to append the appendant data and an error correcting code for the appendant data to said third storage area with data related to a write request as the appendant data without carrying out rewrite for said first storage area and said storage area when a physical address corresponding to a logical address related to the write request corresponds to said first storage area, and register the physical address in said third storage area to which the appendant data and the error correcting code for the appendant data are appended in said address managing portion;
• and
• an error correction processing portion configured to carry out error correction in the appendant data in said third storage area with the appendant data in said third storage area and the error correcting code for the appendant data when the physical address corresponding to the logical address related to a read request corresponds to said third storage area, and carry out error correction in said first storage area with the predetermined number of the plural pieces of data containing therein the data in said first storage area, and the error correcting code in said second storage area when the physical address corresponding to the logical address related to the read request does not correspond to said third storage area.

A storage device, comprising:

• a memory configured to store plural pieces of data and an error correcting code for the plural pieces of data in a first storage area, store the error correcting code in a second storage area so as to correspond to each predetermined number of the plural pieces of data, and store appendant data for any one of the plural pieces of data, and an error correcting code for the appendant data in a third storage area;
• an address managing portion configured to manage a correspondence relationship between logical addresses and physical addresses in said first or third storage area with respect to the plural pieces of data;
• a control portion configured to append the appendant data and an error correcting code for the appendant data to said third storage area with data related to a write request as the appendant data without carrying out rewrite for said first storage area and said storage area when a physical address corresponds to the logical address related to the write request corresponding to said first storage area, and register the physical address in said third storage area to which the appendant data and the error correcting code for the appendant data are appended in said address managing portion;
• and
• an error correction processing portion configured to carry out error correction in the appendant data in said third storage area with the appendant data in said third storage area and the error correcting code for the appendant data when the physical address corresponding to the logical address related to a read request corresponds to said third storage area, and carry out error correction in said first storage area with the predetermined number of the plural pieces of data containing therein the data in said first storage area, and the error correcting code in said second storage area when the physical address corresponding to the logical address related to the read request does not correspond to said third storage area.