INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING METHOD, STORAGE SYSTEM AND NON-TRANSITORY COMPUTER READABLE STORAGE MEDIA

• US 20140289489A1
• Filed: 02/05/2014
• Published: 09/25/2014
• Est. Priority Date: 03/21/2013
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: TAKAHASHI, HIDEYUKI
• Granted Patent: US 9,891,992 B2
• Time in Patent Office: Days
• US Class Current: 711/165
• CPC Class Codes: G06F 11/1076 Parity data used in redundant arrays of independent storages, e.g. in RAID systems
• CPC Class Codes: G06F 2211/1023 Different size disks, i.e. non uniform size of disks in RAID systems with parity
• CPC Class Codes: G06F 2211/1028 Distributed, i.e. distributed RAID systems with parity
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD

Abstract

Provided is information processing apparatus which can prevent performance deterioration, and of keeping fault tolerance, in a storage system having storage nodes of different capacities.

An information processing apparatus, including:

• • a data writing unit to divide received data into a plurality of divided data, generate a plurality of parity data usable when re-configuring the received data having an error, and write divided data and parity data in a plurality of storage nodes;
  • a relocation unit to assign a relocation position of the data written by the data writing unit to the plurality of storage nodes based on a predetermined condition and store the data in the assigned storage nodes; and
  • a data reading unit to read the divided data so as not to read parity data stored in the plurality of storage nodes by identifying the parity data.

Claims

1. An information processing apparatus, comprising:

a data writing unit to divide received data into a plurality of divided data, generate a plurality of parity data usable when re-configuring the received data having an error, and write divided data and parity data in a plurality of storage nodes;

a relocation unit to assign a relocation position of the data written by the data writing unit to the plurality of storage nodes based on a predetermined condition and store the data in the assigned storage nodes; and

a data reading unit to read the divided data so as not to read parity data stored in the plurality of storage nodes by identifying the parity data.

2. The information processing apparatus according to claim 1, wherein

the relocation unit assigns a relocation position so as to store a larger amount of data in a large capacity storage node among the plurality of storage nodes.

3. The information processing apparatus according to claim 2, wherein

the relocation unit assigns a relocation position so as to store a larger amount of the parity data in the large capacity storage node.

4. The information processing apparatus according to claim 1, wherein,

when assigning a relocation position to the plurality of storage nodes, upon a number of the divided data same as a number of parity data generated by the data writing unit having been assigned to an identical storage node continuously, the relocation unit assigns a relocation position so as to store the divided data in another storage node.

5. The information processing apparatus according to claim 1, wherein,

when assigning a relocation position to the plurality of storage nodes, upon a storage node having a number of divided data having been already assigned less than a number of divided data having been already assigned in a storage node to be tried to be assigned data of interest existing, the relocation unit assigns a relocation position so as to store the parity data in the storage node to be tried to be assigned the data of interest.

6. The information processing apparatus according to claim 1, wherein,

when assigning a relocation position to the plurality of storage nodes, upon data not having been assigned a relocation position yet including only the divided data or only the parity data, the relocation unit assigns a relocation position so as to store remaining data in the plurality of storage nodes.

7. The information processing apparatus according to claim 1, wherein,

when reading the divided data stored in the plurality of storage nodes, upon divided data not to be able to be read existing in the divided data, the data reading unit reads the parity data.

8. A storage system, comprising the information processing apparatus according to claim 1 and the storage node being connected with each other via a network.

9. An information processing method, comprising:

dividing received data into a plurality of divided data, generating a plurality of parity data usable when re-configuring the received data having an error, and writing the divided data and the parity data to a plurality of storage nodes;

assigning a relocation position of the data written by the data writing unit to the plurality of storage nodes based on a predetermined condition and store the data in the assigned storage nodes; and

reading the divided data so as not to read parity data stored in the plurality of storage nodes by identifying the parity data.

10. A non-transitory computer readable storage medium storing a computer program causing a computer to execute:

processing of dividing received data into a plurality of divided data, generating a plurality of parity data usable when re-configuring the received data having an error, and transmitting the divided data and the parity data to a plurality of storage nodes;

processing of assigning a relocation position of the data written by the data writing unit to the plurality of storage nodes based on a predetermined condition and store the data in the assigned storage nodes; and

processing of reading the divided data so as not to read parity data stored in the plurality of storage nodes by identifying the parity data.