The invention discloses a dual storage system and method. Management nodes of the system consist of a first management node and a second management node, the first management node and the second management node are mutually mirror images and are used for storing metadata information and data block version information, monitoring a client request and reading and providing data to a client according to the client request. The method comprises a reading operation, a writing operation and a synchronizing operation. As compared with the existing more than three management nodes, the dual storage system and method disclosed by the invention have the advantages that the framework structure is simple and the data consistency is maintained without depending on additional devices. The two management nodes in the dual system are completely independent. When one management node fails, the other management node can continuously provide limited reading and writing service, the problem of single-point failure of the management nodes can be avoided, the reliability of the storage system is guaranteed and the availability of the system is improved.