def METHOD_NAME(self, install_dir=INSTALL_DIR, no_mirrors=False):
    NO_MIRROR_STRING=""
    if no_mirrors:
        NO_MIRROR_STRING="NUM_PRIMARY_MIRROR_PAIRS=1 WITH_MIRRORS=false"
    return subprocess.call([
        "runuser gpadmin -c \"source {0}/greenplum_path.sh \
        && {1} make {2} create-demo-cluster DEFAULT_QD_MAX_CONNECT=150\"".format(install_dir, self.source_gcc_env_cmd, NO_MIRROR_STRING)],
        cwd="gpdb_src/gpAux/gpdemo", shell=True)