rrd gaps <Virus checked>

[Marcus Fleige]

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.

Regards,

Marcus Fleige

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