Server crashing, no explanations

[Derek Ragona]

At 09:17 AM 5/20/2008, Alan Gilmour wrote:
>Hey all,
>
>We have recently been getting a lot of traffic to one of our sites.
>The CPU is consistently during busy periods using 100% utilisation.
>When this happens we have approx 150 apache threads, and the loads
>goes way above 15.
>
>However recently the server has been auto-restarting (when under heavy
>load) with no explanation in any logs. I've checked the console log,
>messages, db logs e.t.c. but no mention of anything wrong.
>
>Brief server summary :
>
>FreeBSD 6.3-STABLE #0:
>CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2800.11-MHz 686-class CPU)
>  Logical CPUs per core: 2
>real memory  = 17716740096 (16896 MB)
>avail memory = 16837763072 (16057 MB)
>FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
>
>We tried installing mbmon and lmmon and healthd, but none seem to work.
>
>Anyone got any suggestions for other things we can try to detect why
>the server is failing? or other ways to check things like CPU temp and
>memory status?
>
>Cheers
>
>Alan

Alan,

Have you run the complete dell diagnostics?  Also I would run the 
diagnostics for the hard drive from that manufacturer as well.

Do you have any issues with power to this server?  Does it have a redundant 
power supply installed?

Any issues with heat?

         -Derek

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