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

[Robert Easton]

Thanks Tobi,

I will discuss this with the team in case there is a case for a percentage
view on ONess. It is just good to know that it cant be done (seeing the
ON/OFF state spread), so I know that I am not missing anything.

Cheers
Mark


Tobias Oetiker-3 wrote:
> 
> Hi Robert,
> 
> what you can do with rrdtool very well, a graph that shows you the
> percentage of 'ON' state. Which is probably a better thing on the
> large scale anyway.
> 
> * create a GAUGE DS
> 
> * when you see OFF, log 1
> 
> * when you see ON, log 0
> 
> Since rrdtool assumes the input to be constant betwen GAUGE
> updates, it will record 100% ONn from the last ON to the current
> OFF.
> 
> If you are not interested in the 'ON-ness' but more in the actual
> events when OFF switched to ON, then I agree it may be best to
> store this information in an sql database.
> 
> cheers
> tobi
> 
> Yesterday Robert Easton wrote:
> 
>>
>> 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
>> >> --
>> >> View this message in context:
>> >>
>> http://www.nabble.com/How-To-Do-A-State-Change-Log-Graph---tp19404183p19404183.html
>> >> Sent from the RRDTool - User mailing list archive at Nabble.com.
>> >>
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>>
> 
> -- 
> Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
> http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900
> 
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