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

[Robert Easton]

Yes, that was what I was thinking. It was just that we are already using
RRDTool within our app and it would have been great if it handled this
scenario also. :)



Joshua Keroes-2 wrote:
> 
> 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?
>> TIA
>>
>> Cheers
>> Mark
>> --
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>>
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