$aliases['prod'] = array(
    'parent' => '@server.xxx', // remote-host & remote-user from server.aliases.drushrc.php $aliases[xxx]
    'uri' => 'xxx.com',
    'root' => '/home/xxx/www/',
    'path-aliases' => array(
     // '%files' => 'sites/xxx/files',
      '%dump-dir' => '/home/xxx/drush-backups',
     ),
     'target-command-specific' => array (
       'sql-sync' => array (
            'disable' => array(
            'devel',
            'fields_ui',
            'views_ui',
          ),
       ),
     ),
);