Patent ID: 7257674

Claim:
A disk storage server for providing a storage area of a storage device to a client, the disk storage server comprising: a storage device group composed of multiple storage devices, wherein the multiple storage devices are divided into a first array that is assigned to a first client and a second array that is assigned to a second client; and a data processing unit for dividing a write data in a write request so that concatenating the divided data is able to restore the original information, and for writing the data so that said plural storage devices storing the write data of each client partly overlap with each other, and wherein a quantity of shared storage devices, that are shared between the first and second clients, is equal to n−(t+1), wherein n is a total number of storage devices assigned to both the first and second clients, and wherein t is a total number of storage devices that can fail within a storage device array while still allowing data in the storage device array to be restored, wherein said data processing unit changes a method for dividing the write data for each client.