[rrd-users] How to get MAX/MIN of non-rates?

[Simon Hobson]

Tony Mountifield wrote:
>> No, how can you be sure that the rate didn't change a microsecond after you read it ?
>
>My point is regarding values that are *not* rates.

Soryy, for rate read value.
You read a value at t=0, you have absolutely no idea what the value at t=1 is, nor t=2, and so on until you read it again at t=10.

>> The way it's doing it now is not incorrect, just not what you want.
>
>I know it's not incorrect, *iff* the supplied gauge values indicate rates
>since the time of the previous value.

It's still not incorrect if storing absolute values. There is no "correct" for this situation - only what best suits your needs.

>I guess my point is that RRD would be enhanced if it was able to store
>values that don't indicate rates, but rather the last known value of a
>scalar quantity, and the time of that value (implying "until further
>notice").

That's not likely. The whole purpose of RRD is to store rates, there are other tools that will store values.

>But anyway, at least I have a workaround.

Indeed.