STORAGE CONTROL DEVICE AND STORAGE SYSTEM

• US 20180046553A1
• Filed: 07/14/2017
• Published: 02/15/2018
• Est. Priority Date: 08/15/2016
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: OKAMOTO, Hiroshi
• Granted Patent: US 10,430,286 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 11/1451 by selection of backup contents
• CPC Class Codes: G06F 11/1456 Hardware arrangements for backup
• CPC Class Codes: G06F 16/128 Details of file system snapshots on the file-level, e.g. snapshot creation, administration, deletion use of snapshots for error detection or correction G06F11/14, G06F11/16
• CPC Class Codes: G06F 16/164 File meta data generation
• CPC Class Codes: G06F 2201/84 Using snapshots, i.e. a logical point-in-time copy of the data

Abstract

A storage control device includes a processor configured to create a first snapshot corresponding to a storage area by a copy-on-write method and management information used for managing a location of a data block updated after the creation, and copy all files included in the first snapshot to a first backup area. The processor is configured to create a second snapshot and identify, on basis of the management information, a second area in a first area of the second snapshot. The first area stores therein first metadata on all of second files included in the second snapshot. The second area is updated after the creation. The processor is configured to identify updated files updated after the creation among the second files, on basis of second metadata among the first metadata. The second metadata is included in the second area and copy the updated files to a second backup area.

Claims

1. A storage control device, comprising:

a memory; and

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

create a first snapshot corresponding to a storage area of a storage device by a copy-on-write method;

create management information and store the management information in the memory, the management information being used for managing a location of a data block updated after the creation of the first snapshot, the data block being included in the storage area;

copy all of first files included in the first snapshot to a first backup area;

create a second snapshot corresponding to the storage area;

identify, on basis of the management information, a second area in a first area of the second snapshot, the first area storing therein first metadata on all of second files included in the second snapshot, the second area being updated after the creation of the first snapshot;

identify updated files updated after the creation of the first snapshot among the second files, on basis of second metadata among the first metadata, the second metadata being included in the second area; and

copy the updated files to a second backup area.

2. The storage control device according to claim 1, wherein

the first metadata includes management data for each of the second files, the management data including at least one of update time information or an archive attribute for a relevant file, the update time information indicating date and time at which the relevant file is updated, the archive attribute indicating whether a backup of the relevant file is completed, and

the processor is configured to:

identify the updated files on basis of the management data included in the second metadata.

3. The storage control device according to claim 1, wherein

the processor is configured to:

perform, in accordance with a first program, a first control process of accessing the storage area in response to a request to access the storage area in units of block;

perform, in accordance with a second program, a second control process of accessing the storage area in response to a request to access the storage area in units of file;

perform the creation of the first snapshot and the second snapshot and the storage of the management information in accordance with the first program or a program added to the first program; and

perform the copy to the first backup area and the copy to the second backup area in accordance with the second program or a program added to the second program.

4. The storage control device according to claim 1, wherein

the processor is configured to:

operate a first virtual machine that accesses the storage area in response to a request to access the storage area in units of block;

operate a second virtual machine that accesses the storage area in response to a request to access the storage area in units of file;

cause the first virtual machine to perform the creation of the first snapshot and the second snapshot and the storage of the management information; and

cause the second virtual machine to perform the copy to the first backup area and the copy to the second backup area.

5. A storage system, comprising:

a storage device; and

a storage control device coupled to the storage device and the storage control device including;

a memory; and

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

create a first snapshot corresponding to a storage area of the storage device by a copy-on-write method;

create management information and store the management information in the memory, the management information being used for managing a location of a data block updated after the creation of the first snapshot, the data block being included in the storage area;

copy all of first files included in the first snapshot to a first backup area;

create a second snapshot corresponding to the storage area;

identify, on basis of the management information, a second area in a first area of the second snapshot, the first area storing therein first metadata on all of second files included in the second snapshot, the second area being updated after the creation of the first snapshot;

identify updated files updated after the creation of the first snapshot among the second files, on basis of second metadata among the first metadata, the second metadata being included in the second area; and

copy the updated files to a second backup area.

6. A non-transitory computer-readable recording medium having stored therein a program that causes a computer to execute a process, the process comprising:

creating a first snapshot corresponding to a storage area of a storage device by a copy-on-write method;

creating management information and storing the management information in the memory, the management information being used storing management information in a memory, the management information being used for managing a location of a data block updated after the creation of the first snapshot, the data block being included in the storage area;

copying all of first files included in the first snapshot to a first backup area;

creating a second snapshot corresponding to the storage area;

identifying, on basis of the management information, a second area in a first area of the second snapshot, the first area storing therein first metadata on all of second files included in the second snapshot, the second area being updated after the creation of the first snapshot;

identify updated files updated after the creation of the first snapshot among the second files, on basis of second metadata among the first metadata, the second metadata being included in the second area; and

copy the updated files to a second backup area.