High Service Check Latency
Mike Guthrie
mguthrie at nagios.com
Tue May 22 16:34:46 CEST 2012
What kind of information do you have about average CPU load or I\O wait
time? Whether Nagios is using ndoutils or not there will be a hardware
limit as to how many disk writes it can handle in a given period of
time. Even though you're only running a few active checks, it could be
a symptom that your machine is having to wait on itself to write to disk
for other things as well. The doc below is written for Nagios XI, but
of a lot of the items apply to Core as well. I would consider exploring
some options with a RAM disk in order to reduce disk activity.
http://assets.nagios.com/downloads/nagiosxi/docs/Utilizing_A_RAM_Disk_In_NagiosXI.pdf
On 5/22/2012 7:55 AM, Simone Felici wrote:
> Il 22/05/2012 13:55, C. Bensend ha scritto:
>
>> I bet you're using NDOUtils. I wouldn't recommend that. I couldn't
>> keep a Nagios server with under 6000 services limping along when
>> NDOUtils was running. Eventually, the check latencies would go
>> through the roof and the entire server would get farther and farther
>> behind.
>>
>> I went to Livestatus. It took me all of 20 minutes to adjust my
>> reports to use the new interface, and I haven't restart my Nagios
>> daemon since (other than normal maintenance).
>>
> Yes, you're right. My problem is, the solution is implemented into OPSView Community edition. It's
> not a problem to alter-modify installation, btw the result is maybe some functionality in the whole
> system (gui or whatever) would not work anymore. Time to move to other nagios installation? Maybe,
> but not right now.
> For now I would like to know a way to identify (and possible solve) the actual high latency. I've no
> idea if I can enable ndo logging or nagios logging to identify issues or bottlenecks.
>
> Simon
>
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