Strange reboot since 9.1

[Service Info]

Hi Marin,
i don't use ZFS on this system, only UFS2+J :)
My LDAP servers reboots more often when i compile a program (yesterday
when i compile samba36), i think it's when server it's charged (my
monitoring server uses 750 NRPE sensors + MRTG under 50 switches every
time and SNORT
But the CPU isn't very used, like memory:

CPU:  8.4% user,  0.0% nice,  0.6% system,  0.0% interrupt, 91.0% idle
Mem: 709M Active, 606M Inact, 885M Wired, 92M Cache, 826M Buf, 5599M
Free

-- 
Cordialement, 

Loïc BLOT
Systèmes UNIX, Sécurité et Réseau
01.64.53.31.54
Laboratoire Charles Fabry, CNRS



Le mercredi 06 mars 2013 à 11:18 +0200, Marin Atanasov Nikolov a écrit :
> 
> 
> 
> On Wed, Mar 6, 2013 at 10:55 AM, Loïc Blot
> <loic.blot at unix-experience.fr> wrote:
>         Hello,
> 
> 
> Hi,
> 
>  
>         Since FreeBSD 9.1 I have strange problems with the
>         distribution. Some
>         servers are rebooting without any kernel panic, instanly.
>         First i
>         thought it's a problem with my KVM system, but one of my
>         FreeBSD under a
>         Dell R210 have the same problem.
>         The servers concerned are now:
>         - Monitoring server
>         - LDAP test server
>         - Some other servers, randomly (not in production).
>         First i thought it's a problem with my FreeBSD install, then i
>         download
>         another time the ISO but the problem was already here. After i
>         try
>         another thing, install 9.0 and upgrade to 9.1 but same
>         problem.
>         How can i get informations about this problem ?
>         
> 
> 
> I've had similar issues with one of my FreeBSD systems. My system had
> spontaneous reboots without any kernel panic, without any clear
> evidence of why it happened.
> 
> 
> After a lot of trials and tests the root cause appeared to be the
> amount of ZFS snapshots I had, which were more than 1K on a 8G system.
> 
> 
> 
> Upgrading from 9.0 to 9.1 didn't solve the issue, as clearly I had to
> do some cleanup of the ZFS snapshots and since then it's more than a
> month without any reboots.
> 
> 
> Few pointers that you could use -- get these systems monitored and
> keep an eye on the monitoring system -- CPU usage, memory, processes,
> network traffic, etc.. I've noticed that my system was running low on
> free memory and that later led me to the ZFS snapshots clue. 
> 
> 
> So, my advise is to get first these systems monitored and watch for
> anything unusual happening. Then further investigate.
> 
> Good luck.
> 
> Regards,
> Marin
> 
>  
>         Thanks for advance.
>         --
>         Best regards,
>         
>         Loïc BLOT, Engineering
>         UNIX Systems, Security and Networks
>         http://www.unix-experience.fr
>         
>         
>         
>         _______________________________________________
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> 
> 
> 
> -- 
> Marin Atanasov Nikolov
> 
> dnaeon AT gmail DOT com
> http://www.unix-heaven.org/