Device, system and method for carrying out data migration between data server clusters

The invention discloses a device for carrying out data migration between data server clusters, and the data are target data relative to to-be-migrated business. The device comprises an initial data input module, a synchronous module and an updating module, wherein the initial data input module is used for inputting the target data which are memorized in a first data server cluster and are written in and before a first time point into a second data server cluster; the synchronous module is used for obtaining an operating log relative to the target data which are written in the first data server cluster after the first time point, wherein the operating log at least comprises the content of the target data which are written in the first data server cluster; and the updating module is used for updating the target data in the second data server cluster according to the operating log obtained by the synchronous module.