System hanged - no info in logs.

[Rafał Radecki <radecki.rafal@xxxxxxxxx>]

Hi All.

I had today a problem with my mail server (2.6.18-274.12.1.el5 #1 SMP Tue
Nov 29 13:37:35 EST 2011 i686 i686 i386 GNU/Linux, CentOS release 5.7
(Final)). On my Cacti graphs I see that there has been much I/O write on
the disks and then there is no more info. Also in logs (messages, dmesg,
netconsole) there is no info for about 15 minutes when there was a problem
with the server.

I would like to have some info in such situations. Do you know any
solutions?

Best regards,
Rafal.
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