[fw-general] hashed_directory_level problem.. help me~

[song7749]

I'm English not well.

I not understand hashed_directory_level problem.
code : 


                $frontendOptions = array(
                   'lifetime' => 60, 
                   'automatic_serialization' => true,
                        'write_control' => true
                );


                $backendOptions = array(
                        'hashed_directory_level' => 2,
                    'cache_dir' => "../product"
                );


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

window system  : APM (apache+php+mysql) 
backend option very well :  'hashed_directory_level' => 2,

but linux system not well. (apache+php+mysql)

I think this problem permission.

error message :
Fatal error: Call to undefined function hash() in
/ZendFramework/library/Zend/Cache/Backend/File.php on line 884


set  'hashed_directory_level' => 0 , no problem..

please help me ~

think you.

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