No space left on device/failed to write session data???

[iana02]

I see my the first page of my site, but at the bottom I also see these errors:

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

My main page is a login page and it just doesn't work. I haven't changed a thing in either the code or the database (and the same code is working perfectly on a different server at the moment!). I've checked through the control panel and it's not like I suddenly got so many visitors that my database is full or anything. Interestingly, I can even see the number of registered users so somehow the database is working but there's still some kind of problem.

My guess is that stoli is the culprit again.
Edit:
Problem resolved without any intervention from me, so thanks to whoever did it.

I have to say that my level of confidence in stoli gets lower and lower...

 

[Christopher]

We raised the amount of /tmp storage there is. This should help things run better.