During weekend my Debian based proxy crashed due to insufficient free space. After reboot it was fine again, so on monday I went hunting for logs and/or explanations for saturday hang but I couldn't find anything.
Grepped any kind of stuff in /var/log/*, checked crontab, mail queue... The only thing I found was monitoring system echos in syslog, with free space getting critical minute after minute (filled up about 80GB in 30mins). No daemons error or so.
I would easily understand what is going on in realtime, but have no idea on how to further debug this kind of problem in the past. Any advice?
This is the first time this has happened in a year or so. Uptime was low, problem did not reoccur in next days.