DATA STORAGE APPARATUS, NON-TRANSITORY COMPUTER-READABLE RECORDING MEDIUM HAVING STORED THEREIN DATA STORAGE APPARATUS CONTROL PROGRAM, AND METHOD FOR CONTROLLING DATA STORAGE DEVICE

• US 20170255391A1
• Filed: 02/17/2017
• Published: 09/07/2017
• Est. Priority Date: 03/01/2016
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Iwata, Satoshi
• Granted Patent: US 10,365,853 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 3/0611 in relation to response time
• CPC Class Codes: G06F 3/065 Replication mechanisms
• CPC Class Codes: G06F 3/0685 Hybrid storage combining heterogeneous device types, e.g. hierarchical storage, hybrid arrays

Abstract

In controlling a second storage device including a plurality of media that store data stored in a first storage device, a processor calculates a ratio of each of a plurality of data blocks, which are classified according to a plurality of pieces of dimension information in the data stored in two or more of the plurality of media, to the data; determines, based on the calculated ratio, whether the data block is to be duplicated; and generates a duplicate of a data block determined to be duplicated and store the generated duplicate into another medium of the plurality of media except for the two or more media. This can reduce the number of times of changing a medium, suppressing lowering in the capacity efficiency.

Claims

1. A data storage apparatus comprising:

a plurality of media that store data stored in a first storage device;

a memory; and

a processor coupled to the memory and the processor configured to;

calculate a ratio of each of a plurality of data blocks, which are classified according to a plurality of pieces of dimension information in the data stored in two or more of the plurality of media, to the data;

determine, based on the calculated ratio, whether the data block is to be duplicated; and

generate a duplicate of a data block determined to be duplicated and store the generated duplicate into another medium of the plurality of media except for the two or more media.

2. The data storage apparatus according to claim 1, wherein the processor determines a data block having the calculated ratio equal to or less than a threshold to be duplicated and determines a data block having the calculated ratio more than the threshold not to be duplicated.

3. The data storage apparatus according to claim 2, wherein

the two or more media comprise a first medium and a second medium that store the data;

the first medium stores a first data block classified into first class data of first dimension information of the plurality of pieces of dimension information and classified into first class data of second dimension information of the plurality of pieces of dimension information, and a second data block classified into the first class data of the first dimension information and classified into second class data of the second dimension information;

the second medium stores a third data block classified into second class data of the first dimension information and classified into the first class data of the second dimension information, and a fourth data block classified into the second class data of the first dimension information and classified into the second class data of the second dimension information; and

when the ratios of the first data block and the third data block to the data, the ratios being calculated by the processor, are equal to or lower than the threshold, the processor determines the first data block and the third data block to be duplicated, generates duplicates of the first data block and the third data block, and stores the duplicates into the other medium.

6. The data storage apparatus according to claim 1, wherein

the processor stores the data stored into the first storage device into the plurality of media;

when serial data that is successive in one of the plurality of pieces of dimension information is to be stored as the data into the plurality of media,

the processor divides the serial data into an antecedent data block at a predetermined boundary and stores the antecedent data block in an antecedent medium included into the plurality of media, and stores a subsequent data block, containing partial data in a predetermined region antecedent to the predetermined boundary in the antecedent data block and subsequent data to the partial data, into a subsequent medium included in the plurality of media.

4. A data storage apparatus comprising:

a plurality of media that store data stored in a first storage device;

a memory; and

a processor coupled to the memory and the processor configured to;

generate a duplicate of the data being stored in two or more of the plurality of media in a first arrangement, and store the duplicate into two or more other media of the plurality of media except for the two or more media, wherein

the processor generates duplicates of a plurality of data blocks classified according to a plurality of pieces of dimension information, and stores the duplicates into the two or more other media in a second arrangement different from the first arrangement of the plurality of data blocks into the two or more media.

5. The data storage apparatus according to claim 4, wherein

the two or more media comprises a first medium and a second medium that store the data;

the two or more other media comprises a third medium and a fourth medium that store the data; and

when the first medium stores a first data block classified into first class data of first dimension information of the plurality of pieces of dimension information and classified into first class data of second dimension information of the plurality of pieces of dimension information, and a second data block classified into the first class data of the first dimension information and classified into second class data of the second dimension information and when the second medium stores a third data block classified into second class data of the first dimension information and classified into the first class data of the second dimension information, and a fourth data block classified into the second class data of the first dimension information and classified into the second class data of the second dimension information,

the processor stores duplicates of the first data block and the third data block into the third medium and stores duplicates of the second data block and the fourth data block into the fourth medium.

7. A non-transitory computer-readable recording medium having stored therein a data storage apparatus control program that causes a computer to execute a process comprising:

calculating a ratio of each of a plurality of data blocks, which are classified according to a plurality of pieces of dimension information in the data stored in two or more of a plurality of media, to the data, the plurality of media being included in a second storage device and being to store data stored in a first storage device;

determining, based on the calculated ratio, whether the data block is to be duplicated; and

generating a duplicate of a data block determined to be duplicated and storing the generated duplicate into another medium of the plurality of media except for the two or more media.

8. The non-transitory computer-readable recording medium according to claim 7, wherein the process further comprising:

determining a data block having the calculated ratio equal to or less than a threshold to be duplicated and determining a data block having the calculated ratio more than the threshold not to be duplicated.

9. The non-transitory computer-readable recording medium according to claim 8, wherein:

the two or more media comprise a first medium and a second medium that store the data; and

the process further comprising;

storing, into the first medium, a first data block classified into first class data of first dimension information of the plurality of pieces of dimension information and classified into first class data of second dimension information of the plurality of pieces of dimension information, and a second data block classified into the first class data of the first dimension information and classified into second class data of the second dimension information;

storing, into the second medium, a third data block classified into second class data of the first dimension information and classified into the first class data of the second dimension information, and a fourth data block classified into the second class data of the first dimension information and classified into the second class data of the second dimension information; and

when the ratios of the first data block and the third data block to the data are equal to or lower than the threshold, determining the first data block and the third data block to be duplicated, generating duplicates of the first data block and the third data block, and storing the duplicates into the other medium.

12. The non-transitory computer-readable recording medium according to claim 7, wherein

the process further comprises:

in storing the data stored in the first storage device into the plurality of media,

when serial data that is successive in one of the plurality of pieces of dimension information is to be stored as the data into the plurality of media,

dividing the serial data into an antecedent data block at a predetermined boundary and storing the antecedent data block into an antecedent medium included in the plurality of media, and

storing a subsequent data block, containing partial data in a predetermined region antecedent to the predetermined boundary in the antecedent data block and subsequent data to the partial data, into a subsequent medium included in the plurality of media.

10. A non-transitory computer-readable recording medium having stored therein a data storage apparatus control program that causes a computer to execute a process comprising:

in generating a duplicate of the data being stored in two or more of a plurality of media in a first arrangement, and storing the duplicate into two or more other media of the plurality of media except for the two or more media, the plurality of media being included in a second storage device and being to store data stored in a first storage device,

generating duplicates of a plurality of data blocks classified according to a plurality of pieces of dimension information, and storing the duplicates into the two or more other media in a second arrangement different from the first arrangement of the plurality of data blocks into the two or more media.

11. The non-transitory computer-readable recording medium according to claim 10, wherein

the two or more media comprises a first medium and a second medium that store the data;

the two or more other media comprises a third medium and a fourth medium that store the data; and

the process further comprising

when the first medium stores a first data block classified into first class data of first dimension information of the plurality of pieces of dimension information and classified into first class data of second dimension information of the plurality of pieces of dimension information, and a second data block classified into the first class data of the first dimension information and classified into second class data of the second dimension information and when the second medium stores a third data block classified into second class data of the first dimension information and classified into the first class data of the second dimension information, and a fourth data block classified into the second class data of the first dimension information and classified into the second class data of the second dimension information,

storing duplicates of the first data block and the third data block into the third medium, and storing duplicates of the second data block and the fourth data block into the fourth medium.

13. A method for controlling a data storage apparatus, the method comprising:

calculating a ratio of each of a plurality of data blocks, which are classified according to a plurality of pieces of dimension information in the data stored in two or more of a plurality of media, to the data, the plurality of media being included in a second storage device and being to store data stored in a first storage device;

determining, based on the calculated ratio, whether the data block is to be duplicated; and

generating a duplicate of a data block determined to be duplicated and storing the generated duplicate into another medium of the plurality of media except for the two or more media.

14. The method according to claim 13, further comprising:

determining a data block having the calculated ratio equal to or less than a threshold to be duplicated and determining a data block having the calculated ratio more than the threshold not to be duplicated.

15. The method according to claim 14, wherein:

the two or more media comprise a first medium and a second medium that store the data; and

the method further comprising;

storing, into the first medium, a first data block classified into first class data of first dimension information of the plurality of pieces of dimension information and classified into first class data of second dimension information of the plurality of pieces of dimension information, and a second data block classified into the first class data of the first dimension information and classified into second class data of the second dimension information;

storing, into the second medium, a third data block classified into second class data of the first dimension information and classified into the first class data of the second dimension information, and a fourth data block classified into the second class data of the first dimension information and classified into the second class data of the second dimension information; and

when the ratios of the first data block and the third data block to the data are equal to or lower than the threshold, determining the first data block and the third data block to be duplicated, generating duplicates of the first data block and the third data block, and storing the duplicates into the other medium.

18. The method according to claim 13, further comprising:

in storing the data stored in the first storage device into the plurality of media,

when serial data that is successive in one of the plurality of pieces of dimension information is to be stored as the data into the plurality of media,

dividing the serial data into an antecedent data block at a predetermined boundary and storing the antecedent data block into an antecedent medium included in the plurality of media, and

storing a subsequent data block, containing partial data in a predetermined region antecedent to the predetermined boundary in the antecedent data block and subsequent data to the partial data, into a subsequent medium included in the plurality of media.

16. A method for controlling a data storage apparatus, the method comprising:

in generating a duplicate of the data being stored in two or more of a plurality of media in a first arrangement, and storing the duplicate into two or more other media of the plurality of media except for the two or more media, the plurality of media being included in a second storage device and being to store data stored in a first storage device,

generating duplicates of a plurality of data blocks classified according to a plurality of pieces of dimension information, and storing the duplicates into the two or more other media in a second arrangement different from the first arrangement of the plurality of data blocks into the two or more media.

17. The method according to claim 16, wherein

the two or more media comprises a first medium and a second medium that store the data;

the two or more other media comprises a third medium and a fourth medium that store the data; and

the method further comprising

when the first medium stores a first data block classified into first class data of first dimension information of the plurality of pieces of dimension information and classified into first class data of second dimension information of the plurality of pieces of dimension information, and a second data block classified into the first class data of the first dimension information and classified into second class data of the second dimension information and when the second medium stores a third data block classified into second class data of the first dimension information and classified into the first class data of the second dimension information, and a fourth data block classified into the second class data of the first dimension information and classified into the second class data of the second dimension information,

storing duplicates of the first data block and the third data block into the third medium, and storing duplicates of the second data block and the fourth data block into the fourth medium.