Originally Posted by ArnOS
Do you have any users who are near their quota limits?
This does not really matters as the relevant thing is that clamav on my server does not create the files in /tmp, so no additional space is needed and used.
Your debugging is correct and it is the same that I found out some months ago before we patched ISPConfig (If I remember correctly, it was 2.2.10 or so). The real question is why does clamav not use the central database file which is updated by freshclam on your server and downloads a new database per user instead.