[rrd-developers] Re: Restarting devices

[Luis F Balbinot]

Tobi,

> what would that buy you, knowing the 'last' value ? RRD knows it
internally,
> so if there is anything interessting we can do with it, let me know ...
> RRD already checks if it is smaller than the last value recorded ...

What happens if at time t-1 I read the value 1000 from my router ifInOctets
via SNMP. At time t I read 500... the counter is suposed to behave as an
increasing value... how will RRDtool handle that? Will it store NaN?

I had the same spike problems that Bert Driehuis had when the equipment is
reset, which makes all my graphs unusable. Yes, I can force the min and max
with 0 and the ifSpeed value, but it might not work all the time. Some
spikes might appear.

What should I do? My idea was to check manually if the current value is
lower than the last value, and then store a NaN in this case.

Best Regards,
Luis F Balbinot

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