Huge Service Latencies

[Hendrik Baecker]

Eli Stair schrieb:

>
> I had a suspicion that the cause might be large numbers of hosts that 
> go down.  Until I get around to them the host checks obviously 
> continue... perhaps that's what's causing the general slowdown in all 
> of nagios.
>
Think about why a host check is executed... not only when a host is 
really down...
Every time when a service check returns a non-OK state nagios will do a 
host check.

On the other side might it be, that you are using dist-monitoring with nsca?

We have had very high latency (600seconds up to somthing around three 
hours) when using nsca on each single service_check result.

Just my 2 cents

> Makes me wish again host checks were parallelized.
>
> /eli
>
> Ludwig Pummer wrote:
>
>> I had large latencies caused by (1) hosts being down and (2) a host 
>> check that took way too long. Nagios will suspend all service checks 
>> while it performs a host check. In my case, the Nagios config I 
>> inherited made 10 attempts at 30 seconds each attempt before 
>> declaring a host to be down, so if one host went down, the host check 
>> took 300 seconds. I typically have 15 hosts down out of 475. I 
>> changed my host checks to 3 attempts at 6 seconds each, and latencies 
>> went way down.
>>  
>>
>> -- 
>> Ludwig Pummer
>> System Administrator
>> Copart Auto Auctions
>>
>>  
>>
>>     
>> ------------------------------------------------------------------------
>>     *From:* nagios-users-admin at lists.sourceforge.net
>>     [mailto:nagios-users-admin at lists.sourceforge.net] *On Behalf Of
>>     *Blake Krone
>>     *Sent:* Monday, December 05, 2005 2:08 PM
>>     *To:* Nagios Users
>>     *Subject:* [Nagios-users] Huge Service Latencies
>>
>>     Service Check Execution Time:    0.10 / 10.04 / 2.175 sec
>>     Service Check Latency:    21.25 / 483.37 / 224.970 sec
>>     Host Check Execution Time:    0.06 / 10.70 / 4.307 sec
>>     Host Check Latency:    0.00 / 529.15 / 5.137 sec
>>     # Active Host / Service Checks:    103 / 236
>>     # Passive Host / Service Checks:    0 / 1
>>
>>     Machine is a P3 733mhz with 128mb ram running 2.6.11-gentoo-r3
>>     kernel and Nagios 2.03b
>>
>>
>>     Any ideas as to why it has such huge latencies?
>>
>
>
>
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