FILE INPUT/OUTPUT METHOD

• US 20100205329A1
• Filed: 08/10/2009
• Published: 08/12/2010
• Est. Priority Date: 02/12/2009
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: TANAKA, Tsuyoshi, UKAI, Toshiyuki, YASUI, Takashi
• Application Number:
  US12/538,546
• Publication Number:
  US 20100205329A1
• Time in Patent Office: Days
• US Class Current: 710/33
• CPC Class Codes: G06F 3/061 Improving I/O performance
• CPC Class Codes: G06F 3/0643 Management of files
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]

Abstract

Provided is a computer system comprising a computer and a plurality of storage devices. The plurality of storage devices store divided data which is obtained by dividing data contained in a file which can be accesed by the computer. The computer holds configuration information of the processor included in the computer and configuration information of the file which is stored by dividing the file; divides an I/O request of the file into a plurality of I/O requests for the plurality of storage devices; determines whether a predetermined condition is satisfied or not; and assigns a plurality of I/O threads of a number determined based on a result of the determination to the divided plurality of I/O requests. The processor inputs/outputs the divided data of the file held in the plurality of storage devices by using the assigned the plurality of I/O threads.

Claims

1. A computer system comprising a computer and a plurality of storage devices coupled to the computer via a network, wherein

the plurality of storage devices store divided data which is obtained by dividing data contained in a file which can be accesed by the computer;

the computer comprises an interface coupled to the network, a processor coupled to the interface, and a memory coupled to the processor;

the computer is configured to;

hold configuration information of the processor included in the computer and configuration information of the file which is stored by dividing the file;

divide an I/O request of the file into a plurality of I/O requests for the plurality of storage devices;

determine whether a predetermined condition is satisfied or not; and

assign a plurality of I/O threads of a number determined based on a result of the determination to the divided plurality of I/O requests; and

the processor inputs/outputs the divided data of the file held in the plurality of storage devices by using the assigned the plurality of I/O threads.

2. The computer system according to claim 1, wherein the computer is configured to determine whether the predetermined condition is satisfied or not by using a number of processors included in the computer.

3. The computer system according to claim 1, wherein the computer is configured to determine whether the predetermined condition is satisfied or not by using a number of the division of the data of the file.

4. The computer system according to claim 2, wherein the computer is configured to determine the processor to operate the plurality of I/O threads by a predetermined method.

5. The computer system according to claim 4, wherein the computer is configured to determine, in the predetermined method, the processor having a specified processor number as the processor to operate the I/O threads in a case where the processor number is specified.

6. The computer system according to claim 4, wherein the computer is configured to determine, in the predetermined method, that the plurality of I/O threads are distributed to the plurality of processors in a case where it is specified to distribute the I/O threads to the plurality of processors.

7. A computer system comprising a computer and a plurality of storage devices coupled to the computer via a network, wherein

the storage device stores divided data which is obtained by dividing data contained in a file which can be accessed by the computer;

and

the computer comprises;

a plurality of processor units comprising an interface coupled to the network, a processor coupled to the interface, and a memory coupled to the processor;

an inter-processor unit network for coupling between the plurality of processor units; and

an inter-processor unit interface for coupling the inter-processor unit network and the processor unit; and

the computer is configured to;

hold configuration information of the processor, configuration information of the file to be stored by dividing the file, and storage device information representing the storage device coupled to each processor unit;

determine whether a predetermined condition is satisfied or not in a case where an I/O request for the file is divided into a plurality of I/O requests for the plurality of storage devices;

assign a plurality of I/O threads of a predetermined number and the plurality of processor units to the divided plurality of I/O requests in a case of which it is determined that the predetermined condition is satisfied; and

input/output the divided data of the file held in the plurality of storage devices by using the plurality of I/O threads.

8. The computer system according to claim 7, wherein the computer is configured to determine whether the predetermined condition is satisfied or not by using a number of processors included in the computer.

9. The computer system according to claim 7, wherein the computer is configured to determine whether the predetermined condition is satisfied or not by using number of the division of the data of the file.

10. The computer system according to claim 7, wherein the computer is configured to determine whether the predetermined condition is satisfied or not based on whether the computer has a memory configuration in which an access route from the processor included in the computer to the memory includes the inter-processor unit network.

11. The computer system according to claim 7, wherein the computer is configured to determine the processor to operate the plurality of I/O threads by a predetermined method.

12. The computer system according to claim 11, wherein the computer is configured to determine, in the predetermined method, the processor to operate the plurality of I/O threads based on the configuration of the plurality of processor units.

13. The computer system according to claim 7, wherein

the computer is configured to:

allocate storage areas of a number of the division of the data contained in the file in response to a request to allocate the memory for storing the data contained in the file;

allocate the storage areas to the plurality of processor units coupled to the storage devices for storing the divided data;

hold correspondence information between the divided data and the allocated storage area; and

use the storage area corresponding to the divided data in a case where the plurality of I/O threads inputs/outputs the data.

14. The computer system according to claim 13, wherein

the computer is configured to:

hold configuration information of the memory; and

determine that the predetermined condition is satisfied if an access route from the processor included in the computer to the memory includes an inter-processor unit network by referring to the memory configuration information.

15. A method of controlling a computer system having a computer and a plurality of storage devices coupled to the computer through a network,

the plurality of storage devices storing divided data which is obtained by dividing data contained in a file which can be accessed by the computer;

the computer having an interface coupled to the network, a processor coupled to the interface, and a memory coupled to the processor;

the computer holding configuration information of the processor included in the computer and configuration information of the file to be stored by dividing the file; and

the method comprising the steps of;

determining whether a predetermined condition is satisfied or not in a case where dividing an I/O request for the file is divided into a plurality of I/O requests for the plurality of storage devices;

assigning a plurality of I/O threads of a predetermined number to the processor based on the result of the determination,; and

performing input/output each of the divided data of the file held in the plurality of storage devices by each of the plurality of I/O threads.

16. A method of controlling a computer system comprising a computer and a plurality of storage devices coupled to the computer through a network,

the computer comprising an interface coupled to the network, a processor coupled to the interface, and a memory coupled to the processor;

the computer having;

a plurality of processor units each including the processor, the memory and the interface;

an inter-processor unit network which for coupling between the plurality of processor units; and

an inter-processor unit interface for coupling the inter-processor unit network and the processor unit;

the computer holding configuration information of the processor, configuration information of the file to be stored by dividing the file, and storage device information representing the storage device coupled to each processor unit; and

the method comprising the steps of;

storing the data contained in a file by dividing into the plurality of storage devices;

determining whether a predetermined condition is satisfied or not in a case where an I/O request for the file into a plurality of I/O requests for the plurality of storage devices in response to the I/O request for the file;

creating or selecting a plurality of I/O threads of a predetermined number in a case where it is determined that the predetermined condition is satisfied; and

inputting/outputting the divided data of the file held in the plurality of storage devices by using the plurality of I/O threads.

17. The method according to claim 16, further comprising the steps of:

allocating storage areas of a number of the division of the data contained in the file in response to an allocation request of the memory for storing the data contained in the file;

allocating the storage areas to the plurality of processor units coupled to the storage devices for storing the divided data;

holding correspondence information between the divided data and the allocated memory area; and

using the storage area corresponding to the divided data in a case where the plurality of I/O threads input/output the data.