XF 1.1 Server error


All of a sudden I'm getting these server errors and I have no idea what's causing them. Help would be greately appreciated.

Edit: Apparently this error means the disk is out of space. But the /tmp directory is only 3MB, and I have plently of disk space left. So why is this error hapenning and how can I fix it?

Error info:
Zend_Db_Statement_Mysqli_Exception: Mysqli statement execute error : Can't create/write to file '/tmp/#sql_c6805_0.MYI' (Errcode: 28) - library/Zend/Db/Statement/Mysqli.php:214
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