STORAGE DEVICE AND DATA STORAGE CONTROL METHOD

• US 20110191396A1
• Filed: 01/28/2011
• Published: 08/04/2011
• Est. Priority Date: 02/03/2010
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Taki, Satoshi
• Granted Patent: US 8,914,336 B2
• Time in Patent Office: Days
• US Class Current: 707/823
• CPC Class Codes: G06F 16/00 Information retrieval; Database structures therefor; File system structures therefor
• CPC Class Codes: G06F 3/061 Improving I/O performance
• CPC Class Codes: G06F 3/0685 Hybrid storage combining heterogeneous device types, e.g. hierarchical storage, hybrid arrays
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD

Abstract

A storage device include: an additional data storing unit storing data in file systems included in a disk array device; a data storing unit for selecting a file system in which the relocation has not been performed from the file systems as a file system in which the relocation is performed and storing data to be stored in the file system in which the relocation has not been performed in the file system in which the relocation is performed in a predetermined order; an area calculator calculating a free space in the file system in which the relocation is performed and data has been stored by the data storing unit; a data extraction unit extracting data that has not been stored in the file systems in which the relocation is completed or the file system in which the relocation is performed; and a data re-storing unit for storing the data.

Claims

1. A storage device comprising:

an additional data storing unit for storing data in a plurality of file systems included in a disk array device;

a data storing unit for, when performing relocation of data stored in the plurality of file systems, until when the relocation in each of the plurality of file systems is completed, selecting a file system in which the relocation has not been performed from the plurality of file systems as a file system in which the relocation is performed and storing data to be stored in the file system in which the relocation has not been performed in the file system in which the relocation is performed in a predetermined order;

an area calculator for calculating a free space in the file system in which the relocation is performed and data has been stored by the data storing unit;

a data extraction unit for extracting data that is able to be stored in the free space calculated by the area calculator from data that has not been stored in the file systems in which the relocation is completed or the file system in which the relocation is performed; and

a data re-storing unit for storing the data extracted by the data extraction unit in the free space.

2. The storage device according to claim 1, further comprising:

a relocating unit for relocating data stored respectively in the plurality of file systems in ascending order of expiration date of storage period,

wherein

the data storing unit sequentially stores data, which is relocated by the relocating unit and will be stored in the file system in which the relocation has not been performed, in the file system in which the relocation is performed in ascending order of the expiration date of storage period of the data,

the area calculator calculates a free space in the file system in which the relocation is performed and data has been stored by the data storing unit;

the data extraction unit extracts data that is able to be stored in the free space calculated by the area calculator from data that has not been stored in the file systems in which the relocation is completed or the file system in which the relocation is performed regardless of the expiration date of storage period; and

the data re-storing unit stores the data extracted by the data extraction unit in the free space.

3. A data storage control method comprising:

storing data in a plurality of file systems included in a disk array device;

in case of performing relocation of data stored in the plurality of file systems, selecting a file system in which the relocation has not been performed from the plurality of file systems as a file system in which the relocation is performed and storing data to be stored in the file system in which the relocation has not been performed in the file system in which the relocation is performed in a predetermined order, until when the relocation in each of the plurality of file systems is completed;

calculating a free space in the file system in which the relocation is performed and data has been stored by the selecting a file system in which the relocation has not been performed from the plurality of file systems as a file system in which the relocation is performed and storing data to be stored in the file system in which the relocation has not been performed in the file system in which the relocation is performed in a predetermined order;

extracting data that is able to be stored in the free space calculated by the calculating a free space in the file system in which the relocation is performed and data has been stored from data that has not been stored in the file systems in which the relocation is completed or the file system in which the relocation is performed; and

storing data extracted by the extracting data that is able to be stored in the free space in the free space.

4. The data storage control method according to claim 3, further comprising:

relocating data stored respectively in the plurality of file systems in ascending order of expiration date of storage period,

wherein

in the selecting a file system in which the relocation has not been performed from the plurality of file systems as a file system in which the relocation is performed and storing data to be stored in the file system in which the relocation has not been performed in the file system in which the relocation is performed in a predetermined order, data are sequentially stored, which is relocated by storing data extracted by the extracting data that is able to be stored in the free space and will be stored in the file system in which the relocation has not been performed, in the file system in which the relocation is performed in ascending order of the expiration date of storage period of the data,

in the calculating a free space in the file system in which the relocation is performed and data has been stored, a free space is calculated in the file system in which the relocation is performed and data has been stored in the selecting a file system in which the relocation has not been performed from the plurality of file systems as a file system in which the relocation is performed and storing data to be stored in the file system in which the relocation has not been performed in the file system in which the relocation is performed in a predetermined order;

in the extracting data that is able to be stored in the free space, data that is able to be stored in the free space calculated by the calculating a free space in the file system in which the relocation is performed and data has been stored, are extracted from data that has not been stored in the file systems in which the relocation is completed or the file system in which the relocation is performed regardless of the expiration date of storage period; and

the data re-storing step stores the data extracted by the extracting data that is able to be stored in the free space.