Simon Hobson schrieb: > Matthias Lemke wrote: > >> I connected my eta pellets heating unit via webservices to my home >> server. I am interesting in counting the amount of pellets per day (warm >> weather days should have low counts of pellets). The unit has a counter >> that counts from zero up forever... The unit sends the value in "kg". >> normally I have around 15...20 kg / day. >> I want to have a graph that shows me the kg/day. So I thought that I can >> write one data per day to the rrd. But, after two nights of testing and >> testing, I have no idea for the correct rrd setup... >> >> Do You have any hints for that challenge :) ? >> >> I want to have two RRAs: >> >> one vor 400 days, one data per day (kg/day). >> second one for kw/weeks for 500 weeks... > > Firstly, remember that RRD stores <things> per second. No matter what > you feed it, that's what it stores.
I remember that from my network usecases (bytes/second)... ok. > So lets say you feed it a value once per day, and the value is 15kg - > then rrd will convert that to 15/86400 = 1.736e-4 (or 0.0001736) > kg/s. Your options are really to multiply by 86400 before storing the > value, or on extracting the data. what do You mean with "extracting the data"? multipliing was one of the idea.... right. > > Another issue is that rrd works in UTC, so the "days" it will work > with are not the same as your local days. You just need to be aware > of that. good point, thanks. > > You will want a counter data type since you conveniently have a > counter to feed it with. > math _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
