title: What does "write failed: No space left on device" mean?
body: <p>I am getting these errors on my site, yet i haven't changed any code or anything, so I don't why this is happening.</p>
  
  <pre><code>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 (/tmp) in Unknown on line 0
  </code></pre>