System Error

[Ophion::Configuration], (6) Unable connect to MySQL Server. Plase check your config.inc.php. [2002:Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)] .
Please contact the Administrator for further details.
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Warning: Unknown: write 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