[rrd-users] How To Do A State Change Log/Graph ?

Joshua Keroes joshua at keroes.com
Wed Sep 10 03:19:57 CEST 2008

rrdtool doesn't know how to write boolean values. I think SQL or
something custom may be more in line with your space constraints.

On Tue, Sep 9, 2008 at 5:33 PM, Robert Easton <mark63 at azurebell.co.nz> wrote:
> We want to see an Area Chart with the ON STATE corresponding to a y-axis
> value of 1 and the OFF STATE corresponding to a y-axis value of 0. As such
> we also want to store the data in an efficient way in RRDTool if this is
> possible in this scenario. Else we will have to move to logging the data in
> a SQL table  instead and then find another graphing tool for this part of
> our application.
> We might have a series of data like this:
> 23May08 11:43:35   ON
> 23May08 11:43:39   OFF
> 01Jun08 12:55:03   ON
> 05Jul08 06:32:01   OFF
> 08Sep08 08:00:02   ON
> In reality this data could show a state change at any time. Note in the
> first instance, above, the state was ON for only 4 seconds. We need to see
> that on the graph, as a visible line, even though the graph might be
> displaying for six months. We need to display this graph for a defined
> period with each ON state change being represented by the area chart showing
> as 1 on the y-axis.
> So can we pass this data to a rrdtool and have it logged efficiently and
> then display the corresponding chart? I would hate to have to generate
> millions of values to achieve this. Four months of one second data is about
> 10,368,000 lines of data!
> Any ideas on an approach?
> Cheers
> Mark
> --
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