[CentOS] System hanged - no info in logs.

[m.roth at 5-cent.us]

Phil Schaffner wrote:
> Rafał Radecki wrote on 04/12/2012 03:07 AM:
>> 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?
>
> Your description is unclear. Did the system recover, or did it have to
> be power cycled or otherwise rebooted?
>
> A hang with no log information can sometimes be caused by driver issues.
<snip>
Or by a failing disk.

Time to use smartctl, if not fsck -c.

      mark