In a CVM cluster, after storage disconnect occurs and all the nodes re-join the cluster, you may see "Unknown DG" error on all the nodes and disk groups appear in "Deported" state on the Master node. Because of this, you cannot bring the volume resources online on the cluster nodes.

As a workaround, first bring any volume resource online on the Master node. This imports the required disk groups on all the other nodes. Then, bring the volume resources online on the remaining nodes of the CVM cluster.