| 摘要 |
Disclosed in an embodiment are a data replication method, device and system. The data replication method comprises: obtaining discrepant data information corresponding to discrepant data of a master volume and a slave volume, the discrepant data information comprising a storage address of the discrepant data on the master volume and a discrepant data judgment value of the discrepant data (201), the discrepant data judgment value comprising the data size of the discrepant data or the discrepant data size of the discrepant data, and the replication bandwidth ratio between the master volume and the slave volume; determining that the discrepant data judgment value is not less than a preset threshold, and replicating the discrepant data from the master volume to the slave volume according to the storage address of the discrepant data on the master volume (202); determining that the discrepant data judgment value is less than the preset threshold, snapshooting the master volume, and replicating the discrepant data to the slave volume according to the snapshot (203). The data replication method and device of the embodiment can reduce the impact of frequent snapshooting on the performance of a primary storage array and system host. |
