rrd gaps <Virus checked>

[Lars Stavholm]

Marcus Fleige wrote:
> Hi there,
> 
> here's my 2 cents about the gaps:
> 
> From my experience, gaps are normally caused by missing datasets over a
> period of time. RRD expects data within a time window defined in
> the "step" and "heartbeat" variables. If data doesn't arrive in this
> window, the value for the defined time frame is set to "NaN" (Not a
> number), resulting in not being displayed in the generated image.
> 
> Missing datasets are often caused by:
> 
> - Huge service latencies, e.g. if you got lots of services to be checked
> in a rather short period of time. (Got this with 3k services, which
> should be checked in a period of 2 minutes -> 25 Checks/second is quite
> a lot...)
> 
> - non-fitting service check intervals. If you check your services in a
> 15 minute interval, but your rrd files expect data every 5 minutes, only
> every third time frame will be filled, resulting in gaps.
> 
> Maybe this is of some use.

It is, it explains a lot. I'll do some adjustments
and tests and report back to this thread.

Thanks
/L


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