service latency troubles

[Antoine Musso]

Andreas Ericsson a écrit :
<snip>
>>    1/ is there any recommended setting for checking the liveness of a 
>> host ? Since this check is synchronous, we want Nagios to achieve this 
>> as fast as possible.
> 
> Upgrade to Nagios 3. It sports parallell hostchecks.

Hello,

We do use Nagios 3 but we had 'use_aggressive_host_checking=1' thus 
triggering a synchronous check and lock the main Nagios process.*
I have changed our check_host_alive command to only send 1 ICMP packet 
and wait for 3 seconds maximum.

This issue is solved ;)

<snip>
>> If not, I am going to check why it takes so long to send a packet to the 
>> remote ndo2db instance.
> 
> That's a good idea. Please let us know what you find.

It is probably waiting for a tcp ack on each write() calls. With a round

The average round-trip with the server is 17ms, it is most certainly the 
issue. From my previous analyse, you can see each call is 20ms average :

    SERVICE_STATUS_DATA (#20)  8321 calls, avg: 0.02s (total 149.48s)

We are now checking latency with a connection to 127.0.0.1 but raise a 
segfault. I am going to write on nagios-dev list ;)


Thanks for your answer Andreas. It helped us a lot.


cheers,

-- 
Antoine MUSSO
DISIT/PROD/QFO/OUT
mailto:antoine.musso at laposte.fr
tél. 02 40 12 73 62
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