[fw-general] Zend_Cache lifetime problems

[Ralf Kramer ZF]

Hi,

I am running into some trouble with Zend_Cache. The problem is that  
the cache gets cleaned every now and then and I dont know why.  
Actually the cache should never get cleaned. Here is the code that I  
use to initialize the cache:

$frontendOptions = array(
    'lifetime' => null,
    'automatic_serialization' => true,
    'automatic_cleaning_factor' => 0,
);

$backendOptions = array(
    'cache_dir' => PATH_TMP .'cache/',
    'hashed_directory_level' => 1
);

$this->cache = Zend_Cache::factory('Core', 'File', $frontendOptions,  
$backendOptions);

In the remaining code I only use
$this->cache->load($identifier);
$this->cache->save($identifier);

I also moved the backend to memcached, but it also happens with this  
backend. I have some millions of records to be cached, I also has set  
the hashed_directory_level to 2 before...

Best regards
 /Ralf