Random reboots

[Jordi Espasa Clofent]

Hi all,

I've a couple of this machines [1] in a prduction environment. I suffer 
random reboots without any clear reason.

A possible power failure it's a discarded point: I use a switched rack 
PDU and anything is showed by the logs. Moreover, I'm talking about 
datacenter environment, so there're a lot of redundant UPSs too.

So, I tend to think it should be a hard/soft conflict, but when I check 
the dmseg and others logs after a random reboot, all appears completely 
normal. I know that a kernel dump will be great help, but this boxes has 
a 4/8GB of RAM, and their /swap is lesser.

Moreover, I have a lot of services in the boxes: http/https (Apache), 
SMTP (Postfix), POP/IMAP (Dovecot) and database (MySQL). This point 
makes too complex to determines what is the origin of the random 
reboots. I have to say that the strange reboots seems that hasn't direct 
relation with the system load: they occurs randomly in stress or calm 
situations.

I've looked at ACPI issues, but, accordint to this helpful info [2], all 
seems ok.

¿Some idea?

[1] 
http://www.superwarehouse.com/Supermicro_Computer_A+_Server_AS1021M-T2+B/AS-1021M-T2+B/ps/1495461

[2] 
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/acpi-debug.html

-- 
Thanks,
Jordi Espasa Clofent