/CLUSTER_SHUTDOWN
       /NOCLUSTER_SHUTDOWN (default)

    Shuts down the entire cluster.

    When you use the /CLUSTER_SHUTDOWN qualifier, each node suspends
    activity just short of shutting down completely, until all other
    nodes in the cluster have reached the same point in the shutdown
    procedure.

    You must specify this option on every cluster node. If any one
    node is not shut down completely, the clusterwide shutdown cannot
    occur.

    You should use the SET ENVIRONMENT/CLUSTER command before you
    issue a SHUTDOWN NODE/CLUSTER_SHUTDOWN command to ensure that all
    nodes in the cluster are shutting down.