Warning: session_start(): open(/var/lib/php5/sess_d8hc7ermceaqrqiqh5p062lf07, O_RDWR) failed: No space left on device (28) in /opt/www/itw66.ru/engine/modules/session/Session.class.php on line 76
it works!
Сюда еще никто не успел написать

Warning: Unknown: open(/var/lib/php5/sess_d8hc7ermceaqrqiqh5p062lf07, O_RDWR) failed: No space left on device (28) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php5) in Unknown on line 0