Abstract: When a master name node has created a file, the master name node performs meta-information synchronization with only a slave name node, and does not perform the meta-information synchronization with a dummy name node. The master name node performs the meta-information synchronization with the dummy name node asynchronously with file creation. Furthermore, the slave name node stores the same meta-information as that stored in the master name node, and the file is stored in a data node placed in the same node as the slave name node and a data node placed in the same node as the master name node.

Abstract: A storage system, including a storing unit, which is configured to be connectable to an information processor, includes a communication data receiving unit, a path information extracting unit, a specifying information creating unit and an access controlling unit. The communication data receiving unit receives communication data transmitted from the information processor. The path information extracting unit extracts path information indicating a communication path between the information processor and the communication data receiving unit, from the communication data received by the communication data receiving unit. The specifying information creating unit creates specifying information indicating the information processor that is the transmission source of the communication data, based on the path information extracted by the path information extracting unit.