Since two days, my Debian (with Parallels Plesk v12.0.18_build1200140606.15 os_Debian 6.0) dedicated server, becomes unreacheable through http, pleks admin, ftp, and ssh. But it remains accepting PING. This occurs each few hours, and i have to restart it through hosting web pannel.
This server is hosting 5 websites, with a 6th one based on Drupal COD distribution, that i recently installed (4 or 5 days ago)
Today, Support team of the hosting company told me that my server run:
"out of memory"
. I installed "Health Monitor" on plesk, and i got this graph: http://fr.tinypic.com/view.php?pic=zjv6yv&s=8
Now, how can I find which process is suddenty taking all this memory ? is there a log file on which I can find this information and if so, which entry should I search for?
If not, is there any other way to know, on that period (between 16h30 and 19h00) what happened on my server?
Thank you all