Storage system, storage control program, and method of storage control

• US 20040225714A1
• Filed: 06/21/2004
• Published: 11/11/2004
• Est. Priority Date: 01/28/2002
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Watanabe, Takashi, Ooe, Kazuichi
• Granted Patent: US 7,343,448 B2
• Time in Patent Office: Days
• US Class Current: 709/203
• CPC Class Codes: G06F 12/0813 with a network or matrix configuration
• CPC Class Codes: G06F 12/0866 for peripheral storage systems, e.g. disk cache
• CPC Class Codes: G06F 3/0601 Interfaces specially adapted for storage systems
• CPC Class Codes: G06F 3/0673 Single storage device

Abstract

A storage system includes a cache device that has a cache memory as a high-speed-access storage medium, a disk device that has a disk as a high-capacity storage medium, and a control device that accepts an access request from a client device and makes the cache device and the disk device execute a process corresponding to the access request. The cache device, the disk device, and the control device are prepared decentrally on a network.

Claims

1. A storage system comprising:

a cache device that has a cache memory as a high-speed-access storage medium;

a disk device that has a disk as a high-capacity storage medium; and

a control device that accepts an access request from a client device and makes the cache device and the disk device execute a process corresponding to the access request, wherein

the cache device, the disk device, and the control device are prepared decentrally on a network.

2. The storage system according to claim 1, wherein the control device transmits a control data to any one of the cache device and the disk device upon receiving the access request, and based on the control data, any one of the cache device and the disk device accesses to any one of the cache memory and the disk and transmits an access result directly to the client device.

3. The storage system according to claim 1, wherein the control device transmits a control data to the disk device upon receiving the access request, and the disk device transmits an access result to a plurality of destinations based on the control data.

4. The storage system according to claim 3, wherein the destinations are the client device and the cache device, and the cache device stores the access result in the cache memory.

5. The storage system according to claim 1, wherein the control device transmits a control data to the cache device upon receiving the access request, and the cache device transmits an access result to a plurality of destinations based on the control data.

6. A storage control program that is executed on a storage system, the storage system comprising a cache device that has a cache memory as a high-speed-access storage medium, and a disk device that has a disk as a high-capacity storage medium that are prepared decentrally on a network, the storage control program making a computer realize:

accepting an access request from a client device;

creating a control data that makes the cache device and the disk device execute a process corresponding to the access request; and

transmitting the control data to any one of the cache device and the disk device.

7. The storage control program according to claim 6, wherein the control data is a data that directs any one of the cache device and the disk device to access any one of the cache memory and the disk, and to transmit an access result directly to the client device.

8. The storage control program according to claim 6, wherein the control data is a data that directs the disk device to transmit the access result to a plurality of destinations.

9. The storage control program according to claim 6, wherein the control data is a data that directs the cache device to transmit the access result to a plurality of destinations.

10. A storage control method that is performed on a storage system, the storage system comprising a cache device that has a cache memory as a high-speed-access storage medium, and a disk device that has a disk as a high-capacity storage medium that are prepared decentrally on a network, comprising:

accepting an access request from a client device;

creating a control data that makes the cache device and the disk device execute a process corresponding to the access request; and

transmitting the control data to any one of the cache device and the disk device.

11. A storage system includes a cache device that has a cache memory as a high-speed-access storage medium, a disk device that has a disk as a high-capacity storage medium, and a control device that accepts an access request from a client device and makes the cache device and the disk device execute a process corresponding to the access request. The cache device, the disk device, and the control device are prepared decentrally on a network.