Cloud storage system with balanced multi-server load

The invention relates to a cloud storage system with a balanced multi-server load. A conventional cloud storage system, in part, has defects that firstly, since the cloud storage system is tightly coupled with an own platform system, intersystem integration and secondary development are not facilitated; and secondly, logical volume management server bottleneck seriously affects the whole performance and the reliability of the system. According to the invention, multiple logical volume management server bottleneck manages a background storage device via logic volume management technology based on a colony; an intermediate control service coordinates and controls modules of the system to operate, and distributes storage resources for a user virtual machine; and besides, the reliability and the performances of the system are ensured via a fault management mechanism and a dynamic load equalization mechanism. The system provided by the invention achieves the reliable storage device management of a cloud storage server is achieved; on performance, the storage device reading/writing throughput capacity of the system is affectively improved, and averaged reading/writing response time is shortened.