Max number of services that can be monitored ?

[Andreas Ericsson]

misc at viceconsulting.co.nz wrote:
> Hi Hendrick,
> 
> 
>>I would suggest, that Alex should enable the perf-data, to see if
>>there is one host or special service that screws up the latency.
>>We have one Server with double proceccor Xeon 1,0Ghz, 2 Gig of Ram
> 
> 
> OK, so you're saying there may be one host that is particularly lagged and
> therefore increasing my average latency?
> 
> 
>>1. Enable the perf-data. (Tip: Say Nagios it should write both, host
>>and service perf data in one file. So you can see how Nagios works
>>and when the latency screws up)
>>2. Perhaps, even if the memory is not eaten up by nagios, think about
>>to give your server more RAM.
>>3. Try to figure out, if your system has sometimes wa-cycles. If
>>every process on your system is waiting for IO, then the ram is NOT
>>eaten up and swapping isn't used to, but even no performance.
> 
> 
> Well I do have perf-data enabled and I am graphing the Nagios server's
> metrics.  Basically latency used to be fine, but I added 55 new hosts then
> it slowed down.  The only change in the graphs is the CPU usage went from
> ~50% to 90-100%.  I'm also graphing CPU IO Wait% and IO Wait is
> negligible.
> 
> 
>>Please tell us, what service_check interval you have. If your nagios
>>checks nearly every minute it may be hard for: a) your monitoring
>>host, b) the (local) network, c) the (possibly existing) wan network.
> 
> 
>>From nagios.cfg:
> 
> interval_length=60
> 
> 
> 
>>Are your 60 hosts normaly up and running or do they often falls down?
>>Everytime when nagios is executing a host check, all other service
>>checks are beeing "stopped", because a host check gets a higher check
>>priority then a service check. So if the scheduler has enough to do
>>for service checks and there are some host checks comming between the
>>other service checks are executed later then they normaly were
>>scheduled.
> 
> 
> The 60 hosts are usually always up.... I may disable host checking though,
> I don't find its that useful.
> 

The docs covering scheduled hostchecks tells you explicitly that it is a 
very bad idea indeed since no other checks are run when a host check is.

> 
>>Hope that gives some ideas.
> 
> 
> Yeah... thanks for that info.  Gives me a couple of things to think about.
> 
> -Alex.
> 
> 
> 
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-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231


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