Re: Pinging a Device Every Second

["Dale W. Carder" <dwcarder () es net>]

Thus spake Christian Meutes (christian () errxtx net) on Fri, Dec 21, 2018 at 02:41:23PM +0100:
> Depending on your requirements and scale - but I read you want history -
> it's probably less a demand on CPU or network resources, but more on IOPS.
>
> If you cache all results before writing to disk, then it's not much of a
> problem, but by just going "let's use RRD/MRTG for this" your IOPS could
> become the first problem. So you might look into a proper timeseries
> backend or use a caching daemon for RRD.

Having once written a caching daemon for mrtg/rrdtool, the advent of SSD
arrays has made iops largely irrelevant.  (I had ~ 1.2M targets in mrtg
on that machine)

Dale
 
 
> On Sat, Dec 15, 2018 at 4:48 PM Colton Conor <colton.conor () gmail com> wrote:
>
> > How much compute and network resources does it take for a NMS to:
> >
> > 1. ICMP ping a device every second
> > 2. Record these results.
> > 3. Report an alarm after so many seconds of missed pings.
> >
> > We are looking for a system to in near real-time monitor if an end
> > customers router is up or down. SNMP I assume would be too resource
> > intensive, so ICMP pings seem like the only logical solution.
> >
> > The question is once a second pings too polling on an NMS and a consumer
> > grade router? Does it take much network bandwidth and CPU resources from
> > both the NMS and CPE side?
> >
> > Lets say this is for a 1,000 customer ISP.
>
> -- 
> Christian Meutes
>
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