Data migration control method, data migration method and data migration device

The invention discloses a data migration control method in a CC-NUMA (cache coherent-non-uniform memory access) system. Bandwidth occupancy rates of transmission links contained in data transmission paths between a source end NC (node controller) and a destination end NC are led in to serve as a to-be-utilized selection basis of the data transmission paths when a DMA (direct memory access) mode is adopted to migrate data, so that when the DMA mode is adopted for data migration, the data transmission paths are no longer selected blindly, proper data transmission paths are selected according to the selection basis for data migration, and the problem of easiness in formation of hot transmission paths and data congestion when the DMA mode is adopted for data migration is avoided. An embodiment of the invention further provides a data migration control device, a data migration method and the data migration device in the CC-NUMA system.