Data cloning method and system

Abstract

The embodiment of the present invention provides a data cloning method and a data cloning system, wherein the method comprises: determining whether a main controller gets out of order or not, if so, sending a cloning stop instruction to the main controller, receiving feedback information fed back by the main controller after stopping cloning, determining the data that are not cloned in a source volume, sending a cloning instruction to a subordinate controller, and cloning the data that are not cloned in the source volume by virtue of the subordinate controller after receiving the cloning instruction. When the main controller gets out of order, a cloning function is switched to and carried out on the subordinate controller, the waiting for the repair of the main controller is not required, and the data are not required to recover from a target volume to ensure that cloning operation can be performed continuously, so that the waiting time of cloning recovery is extremely short, the uninterrupted operation of upper-layer service is ensured, the real-time consistent data backup of user data is ensured, and the reliability of the data is improved.

Description

technical field [0001] The invention relates to the technical field of data disaster recovery, in particular to a data cloning method and system. Background technique [0002] Cloning technology refers to the establishment of a cloning relationship between the source volume and the target volume in the storage system. When the user triggers the cloning action, the data will be backed up from the source volume to the target volume. The cloning action to the target volume, and then process the received IO, so that the content of the target volume and the content of the source volume are consistent at the time of cloning, which can ensure that when any volume fails and data is damaged, there is always a volume whose data is available and the most recent of. At present, the cloning operation is usually completed by establishing and activating the cloning relationship between the source volume and the target volume in the controller, and when the user triggers the cloning action...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the embodiment of the present invention provides a data cloning method and system to solve the problem in the prior art that when the controller fails, the ongoing cloning action will be terminated, and the user's service will also be terminated. After the controller is repaired, the cloning operation can be performed again. Even if the controller is restored, the data needs to be recovered from the target volume to continue cloning and provide external services. The waiting time for restoring cloning is long, and the uninterrupted upper-layer business cannot be guaranteed. running, and cannot guarantee real-time consistent data backup of user data, which reduces the reliability of data

Images