protected $_options = array(
        'cache_dir' => 'tmp/',
        'file_locking' => true,
        'read_control' => true,
        'read_control_type' => 'crc32',
        'hashed_directory_level' => 0,
        'hashed_directory_perm' => 0700,
        'file_name_prefix' => 'zend_cache',
        'cache_file_perm' => 0600,
        'metadatas_array_max_size' => 100