@classmethod
def bld(cls, adapter, name, repos_pv, first_node):
    """Create a fresh Cluster EntryWrapper.

        :param adapter: A pypowervm.adapter.Adapter (for traits, etc.)
        :param name: String name for the Cluster.
        :param repos_pv: storage.PV representing the repository disk.
        :param first_node: Node wrapper representing the first VIOS
        to host the Cluster.  (The Cluster Create API only accepts a single
        node; others must be added later.)  The VIOS must be able to see each
        disk.
        """
    clust = cls._bld(adapter)
    clust.repos_pv = repos_pv
    clust.nodes = [first_node]
    clust._name(name)
    return clust
