cause of reboot

[Patrick Lamaiziere]

Le Mon, 30 Sep 2013 17:24:18 +0300,
Emre Çamalan <mailist at yandex.com> a écrit :

> Hi,
> my server reboots every night and same o'clock last 10 days. But this
> machine's uptime was 96days.
> 
> Suddenly reboot this machine and now this continue every night again
> and again.
> 
> I didn't find any reason and I didn't change anything else.
> 
> I looked "last" command, 
> reboot ~ ~   AM 03.15  ~

The last time It happened (one month ago) to me it was the hard disk
(periodic scripts read a large part of the disk).

If the disk is smart capable try a full test with smartctl
(sysutils/smartmontools)

HTH, regards