'Create a new volume.'

def create_volume(self, name, size, description=None, historypolicy=None, blocksize=None):

    cmd = RdxApiCmd(cmd_prefix=[VOLUMES, NEW_COMMAND])
    cmd.set_argument(name)
    cmd.add_flag('size', size)
    cmd.add_flag('description', description)
    cmd.add_flag('policy', historypolicy)
    cmd.add_flag('blocksize', blocksize)
    self._run_cmd(cmd)
