RAID CONFIGURATION MANAGEMENT DEVICE AND RAID CONFIGURATION MANAGEMENT METHOD

• US 20150121002A1
• Filed: 09/22/2014
• Published: 04/30/2015
• Est. Priority Date: 10/24/2013
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Tsuchiyama, Yukari, DAIKOKUYA, Hidejirou, IKEUCHI, Kazuhiko, Maeda, Chikashi, URATA, Kazuhiro, WATANABE, Takeshi, KUBOTA, Norihide, KOBAYASHI, Kenji, TSUKAHARA, Ryota
• Granted Patent: US 9,501,362 B2
• Time in Patent Office: Days
• US Class Current: 711/114
• CPC Class Codes: G06F 11/1096 Parity calculation or recalculation after configuration or reconfiguration of the system

Abstract

A CM 10 includes an unmount detector 142 and a mount detector 144 that monitor unmount and mount of each disk 21 of a RAID configuration, a write request manager 143 that manages a write request for writing data to a disk 21 that is unmounted, a consistency determination unit 145 that, when mount of a disk 21 of the RAID configuration is detected, makes a determination on consistency of the data of the disk 21 in which mount is detected on the basis of the managed write request, and a RAID incorporating unit that, when it is determined that the data lacks consistency, performs processing for recovering data expected to be written by the write request issued to the disk 21 in which mount is detected while the disk 21 is unmounted and incorporates the disk 21 in an original RAID configuration.

Claims

1. A RAID configuration management device that manages a RAID configuration that is constituted by a plurality of drives, the RAID configuration management device comprising:

a monitoring unit that monitors unmount and mount of each drive of the RAID configuration;

a writing manager that manages a write request for writing data to a drive that is unmounted;

a determination unit that, when the monitoring unit detects mount of a drive of the RAID configuration, makes a determination on consistency of the data of the drive in which mount is detected on the basis of the write request that is managed by the writing manager; and

an incorporating unit that, when the determination unit determines that the data lacks consistency, performs processing for recovering data expected to be written by the write request that is issued to the drive in which mount is detected while the drive is unmounted and incorporates the drive in an original RAID configuration.

2. The RAID configuration management device according to claim 1, further comprising:

a storage unit that stores, per drive, drive information that associates identification information that identifies a drive with RAID information that is information on the RAID in which the drive is incorporated,

wherein, on the basis of the drive information that is stored in the storage unit and drive information that is previously stored in the drive in which unmount or mount is detected, the monitoring unit monitors unmount and mount of the drive of the RAID configuration.

3. The RAID configuration management device according to claim 1, wherein

when a write request for writing data is issued to a drive that is unmounted, the writing manager manages the write request by managing timestamps preceding and following writing of the data to a different storage area that is determined for the drive that is unmounted,

when mount of the unmounted drive is detected, the determination unit makes a determination on the consistency of the data by determining whether there is a difference between the timestamps preceding and following the writing of the data, and

when the determination unit determines that there is a difference between the timestamps preceding and following the writing of the data, the incorporating unit incorporates the drive to which the write request is issued in the original RAID configuration by writing back, to the drive, the data from the different storage area to which the data is written while the drive is unmounted.

4. A non-transitory computer-readable recording medium having stored therein a RAID configuration management program causing a RAID configuration management device to execute a process comprising:

monitoring unmount and mount of each drive of the RAID configuration;

managing a write request for writing data to a drive that is unmounted;

when the monitoring detects mount of a drive of the RAID configuration, making a determination on consistency of the data of the drive in which mount is detected on the basis of the write request that is managed by the managing; and

when the determining determines that the data lacks consistency, performing processing for recovering data expected to be written by the write request that is issued to the drive in which mount is detected while the drive is unmounted and incorporating the drive in an original RAID configuration.

5. A RAID configuration management method performed by a RAID configuration management device that manages a RAID configuration that is constituted by a plurality of drives, the RAID configuration management method comprising:

monitoring unmount and mount of each drive of the RAID configuration;

managing a write request for writing data to a drive that is unmounted;

when the monitoring detects mount of a drive of the RAID configuration, making a determination on consistency of the data of the drive in which mount is detected on the basis of the write request that is managed by the managing; and

when the determining determines that the data lacks consistency, performing processing for recovering data expected to be written by the write request that is issued to the drive in which mount is detected while the drive is unmounted and incorporating the drive in an original RAID configuration.