Hi my friend!
You can found this information on next URL
http://support.huawei.com/hedex/hdx.do?docid=EDOC1100046473However, I send you the procedure in that URL
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Dismissing a Cluster
To change the IP address of the master domain server of a cluster, you need to dismiss the cluster and delete the floating IP address of the cluster beforehand.
To dismiss a cluster, proceed as follows:
1.Log in to the OMU portal of the master domain server as the Admin user.
2.Choose Cluster Management > Cluster Management.
3.Select a cluster node from the navigation tree on the left and click Dissolve.
4.In the dialog box that is displayed, click Confirm.
To delete the floating IP address of the cluster, proceed as follows:
1.Log in to the OMU portal of the master domain server as the Admin user.
2.Choose Local Configuration > Server Configuration.
3.Click Remove floating IP. The floating IP address of the master domain server is deleted.
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Hope you found this usefull
Regards!