STORAGE APPARATUS AND CONTROL METHOD THEREFOR

• US 20110302369A1
• Filed: 06/02/2011
• Published: 12/08/2011
• Est. Priority Date: 06/03/2010
• Status: Abandoned Application

• Current Assignee: Buffalo Incorporated (Melco Holdings Incorporated)
• Original Assignee: Buffalo Incorporated (Melco Holdings Incorporated)
• Inventors: GOTO, Satoru, HARA, Yukihito
• Application Number:
  US13/151,760
• Publication Number:
  US 20110302369A1
• 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
• CPC Class Codes: G06F 2211/1004 Adaptive RAID, i.e. RAID system adapts to changing circumstances, e.g. RAID1 becomes RAID5 as disks fill up
• CPC Class Codes: G06F 2211/1061 Parity-single bit-RAID4, i.e. RAID 4 implementations
• CPC Class Codes: G06F 3/0607 by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device
• CPC Class Codes: G06F 3/0632 by initialisation or re-initialisation of storage systems
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD

Abstract

A storage apparatus includes a storage unit including plural storage media, and a controller for controlling the storage unit. After a new storage medium has been added to the storage unit, the controller causes the new storage medium to store error correction codes for data stored in the respective storage media pre-existing in the storage unit. When new data is stored in the storage unit after the addition of the new storage medium, the controller causes the pre-existing storage media and the new storage medium to dispersedly store the new data and error correction codes for the new data.

Claims

1. A storage apparatus comprising:

a storage unit including plural storage media; and

a controller for controlling the storage unit,

wherein after a new storage medium has been added to the storage unit, the controller causes the new storage medium to store error correction codes for data stored in the respective storage media pre-existing in the storage unit, and

when new data is stored in the storage unit after the addition of the new storage medium, the controller causes the pre-existing storage media and the new storage medium to dispersedly store the new data and error correction codes for the new data.

2. The storage apparatus according to claim 1, wherein before the addition of the new storage medium, the controller causes the pre-existing storage media to dispersedly store data and error correction codes for the data.

3. The storage apparatus according to claim 2, wherein after the addition of the new storage medium, the controller causes the pre-existing storage media and the new storage medium to dispersedly store data and error correction codes which are greater in the number of types than before the addition of the new storage medium to the storage unit.

4. The storage apparatus according to claim 1, wherein before the addition of the new storage medium, the controller causes the pre-existing storage media to store the same data.

5. The storage apparatus according to claim 4, wherein after the addition of the new storage medium, the controller causes the pre-existing storage media and the new storage medium to dispersedly store data and error correction codes.

6. The storage apparatus according to claim 1, wherein the controller causes the new storage medium to store error correction codes for data stored in the pre-existing storage media, when an instruction for a predetermined operation is received from a user after the new storage medium has been added to the storage unit.

7. A control method for a storage apparatus including a storage unit having plural storage media, comprising:

the step of storing, in the new storage medium, error correction codes for data stored in the respective storage media pre-existing in the storage unit, after the addition of a new storage medium to the storage unit; and

the step of dispersedly storing new data and error correction codes for the new data in the pre-existing storage media and the new storage medium, when the new data is stored in the storage unit after the addition of the new storage medium.