Webserver stopped showing webpages

[manarak]

My Webserver today stopped showing webpages.
Other services are still running, mail works, so does ftp, ssh, etc.
When a page is called through the browser it seems at first to load veeeery slow, but in fact nothing reaches the browser, which after a while shows "unable to display".

A server reboot solved the problem for 10 minutes, but then the problem was back.

Fedora Core 2, Plesk 7.5.4

What could be a typical cause for this behavior?
Could a full disk/partition cause that? (I will check this when I will have access to the server in some hours)

What should I do to diagnose it? (what commands should I type)

Thank you

 

[manarak]

partition /var was full, due tu huge mysql logs in var/lib/mysql.
I freed 14 GB of logs!

Now can someone explain me why these logs are not regularly purged by a plesk cron job?

 

[manarak]

this is a very serious problem since it causes the server to stop serving weppages as well as data loss for received emails that cannot be stored !!!