added PNP in the default mode; how serious is the performance degradation to warrant a switch to the bulk mode?

[Jim Avery]

2009/2/5 Rahul Nabar <rpnabar at gmail.com>:
> So, I finally succeed in configuring PNP for Nagios (whew!!)! It's been a
> long bloody battle but I think I eventually won! :)
>
> I've just added PNP performance graphs to my 4-switches for now.
>
> Am a bit hesistant about adding it to all my 300 hosts due to all the
> caeveats about performance and PNP in the default mode. Any other PNP users?
> How many services / hosts are you running PNP performance graphs on? How is
> your performance? Have you been forced to switch to the bulk mode already?

A lot depends on how frequently you collect your data.  If you gather
performance data for ten services on each of those 300 hosts every
minute you're probably asking for trouble, but if you only gather a
couple of metrics from each host every 15 minutes, that's not likely
to break anything.

If you add PNP to all of your 300 hosts and your Nagios server
struggles, I'd definitely consider whether you can reduce your check
frequency and still have all the information you need before messing
about with bulk mode.

I have implemented bulk mode, but only on the local server.  My
four-cpu system is coping okay with 1500 or so rrd files, but a lot of
those are updated using checks at 5 minute, 15 minute or even less
frequent intervals.  I don't think implementing bulk mode locally made
a great deal of difference but expect that offloading the processing
to another server would make a huge difference if I ever get around to
doing that.

If you're worried about performance, I'd also maybe look at how
efficient your plugins are.  If you're running a large number of
checks at frequent intervals using inefficient plugins this can have a
marked detrimental effect on performance.

Cheers,

Jim

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