zend framework when using both mencache and cache page

I'm using zend frameword version 1.11

My site using memcache to save session but want using more zend cache page to cache page html

Result: cache page html is not save right cache dir config, it save public path and data in file is null (0 KB)

To be bro help

my config in application.ini

; MEMCACHE CONFIG
resources.cachemanager.memcached.frontend.name                            = Core
resources.cachemanager.memcached.frontend.options.automatic_serialization = On
resources.cachemanager.memcached.backend.name                             = Memcached
resources.cachemanager.memcached.backend.options.servers.one.host         = 10.60.80.51
resources.cachemanager.memcached.backend.options.servers.one.port         = 11211
resources.cachemanager.memcached.backend.options.servers.one.persistent   = On

; session savehandler class
resources.session.name = PHPGAME1_SESSION
resources.session.saveHandler.class        = Zend_Session_SaveHandler_Cache
resources.session.gc_maxlifetime           = 7200
resources.session.cookie_domain            = ".game5.vn"

;cofig cache page
resources.cacheManager.page.backend.options.public_dir = PUBLIC_PATH "/cached"
resources.cacheManager.pagetag.backend.options.cache_dir = WEB_PATH "/data/cache/tags"
resources.frontController.params.disableOutputBuffering = true
resources.cacheManager.page.backend.options.disable_caching = false

My boostrap to init session handler

protected function _initSessionId()
{
    $opts = $this->getOptions();
    if (isset($opts['resources']['session']['saveHandler']['class']) &&
            'Zend_Session_SaveHandler_Cache' == $opts['resources']['session']['saveHandler']['class']) {
        $this->bootstrap('session');
        $cache = $this->bootstrap('cachemanager')
        ->getResource('cachemanager')
        ->getCache('memcached');
        Zend_Session::getSaveHandler()->setCache($cache);

    }                     
    $defaultNamespace = new Zend_Session_Namespace();
    if (!isset($defaultNamespace->initialized)) {
        Zend_Session::regenerateId();
        $defaultNamespace->initialized = true;
    }
}

In init controller, i have using helper to save cache page, action which want save cache page

$this->_helper->cache(array('index'), array('content'));

Many thanks