کد:
$config['Cache']['class'][0] = 'vB_Cache_Db'; //regular cache 
$config['Cache']['class'][1] = 'vB_Cache_Memory'; //fastest cache 
$config['Cache']['class'][2] = 'vB_Cache_Db'; //largest cache and longest life. 


    // ****** DATASTORE CACHE CONFIGURATION ***** 
    // Here you can configure different methods for caching datastore items. 
    // vB_Datastore_Filecache  - to use includes/datastore/datastore_cache.php 
    // vB_Datastore_APC - to use APC 
    // vB_Datastore_XCache - to use XCache 
    // vB_Datastore_Memcached - to use a Memcache server, more configuration below 
// $config['Datastore']['class'] = 'vB_Datastore_Filecache'; 

    // ******** DATASTORE PREFIX ****** 
    // If you are using a PHP Caching system (APC, XCache, eAccelerator) with more 
    // than one set of forums installed on your host, you *may* need to use a prefix 
    // so that they do not try to use the same variable within the cache. 
    // This works in a similar manner to the database table prefix. 
// $config['Datastore']['prefix'] = ''; 

    // It is also necessary to specify the hostname or IP address and the port the server is listening on 
/* 
$config['Datastore']['class'] = 'vB_Datastore_Memcached';
در این قسمت با اضافی کردن 2 عدد // به اول $config['Cache']['class'] و config['Datastore']['class'] این 2 مورد غیر فعال خواهند شد . و باید در سرور Memcached هم فعال باشه . در کل بااین عنوان کانفیگ سرور جدید با سایت شما سازگار نیست .