Server crashing, no explanations

[Roberto Nunnari]

Crash dumps should help.


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
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