[rrd-users] need help with figuring out how many minutes furnace is on

[Steve Shipway]

Simon said:
> I'd suggest you want a DS for heating which is either 0 (off) or 1
> (on), and update this as often as you can. And have a separate DS for
> cooling, again 0 or 1.

I strongly agree; otherwise this makes higher-granularity graphs very awkward, unless there is a 1cdp=1dp RRA that goes on forever to avoid averaging, which would have other problems, of course.

If you cannot do the calculation before storage, then maybe define two calculated DSs that that the status DS (0,1,2) and convert to on calculated DS that is heating 0/1 and one that is cooling 0/1 ?  Once you have this, then it is easy to get percentage use time -- just create an RRA that is 1cdp=1day and the average of the heating DS x100 is the percentage time the heating is on that day!  Much simpler to do all the necessary calculations.

Steve

Steve Shipway
ITS Unix Services Design Lead
University of Auckland, New Zealand
Floor 1, 58 Symonds Street, Auckland
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