| 摘要 |
A conversion control unit correlates real block addresses of every storage device with virtual block addresses in a virtual storage device assigns a storage virtualization device for each virtual block address, distributes storage conversion tables containing the assigned correlated virtual block address and the real block address to each of the storage virtualization devices, and distributes a routing table containing the correlated virtual block address and the storage virtualization device to each server. A load monitoring unit and a load distribution processing unit provided in each storage virtualization device monitor the processing load. A failure recovery processing unit detects failure of storage virtualization device, and reassigns the virtual block address assigned to an overloaded or broken down storage virtualization device to another operative storage virtualization device.
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