<div dir="ltr">Thanks for the confirmation! The sentence<div><span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium">Instead you will need to find max( max(counter1),max(counter2) )</span><br>
<div class="gmail_extra">(<a href="http://www.vandenbogaerdt.nl/rrdtool/min-avg-max.php">http://www.vandenbogaerdt.nl/rrdtool/min-avg-max.php</a>) confused me a bit. It's not what I need or want ;-)</div><div class="gmail_extra">
So what I probably will do is use xport to calculate the sum with high granularity (maxrows skyhigh), and then with some scripting (I usually use perl for that) extract the data and populate a new rrd with the sum.<br></div>
<div class="gmail_extra"><br></div><div class="gmail_extra">Like you I'm still pondering on how to deal with unknown data. In my case I have 7 systems and if one of them has a period with <font face="courier new, monospace">unknown </font>values, it still can mean several things:</div>
<div class="gmail_extra">- it still carried traffic, but it did not end up in the rrd (e.g. simple temp connection problem)</div><div class="gmail_extra">- it really was down and the other 6 systems carried all the traffic</div>
<div class="gmail_extra">So do I use + or ADDNAN for the total sum? Either choice can give "wrong" resulting graphs. Without having knowledge about why some data is <font face="courier new, monospace">unknown</font> there is no way to correctly interpret these total sum graphs. In my particular case I probably will use ADDNAN and add some indication about how many systems contributed to the total sum. Or maybe I can do a trick like AREA graphing both the ADDNAN sum and the + sum on top of each other. I need to think about this more. Important also is that it is obvious what is shown in the graphs. </div>
<div class="gmail_extra"><br><div class="gmail_quote">On Tue, Aug 27, 2013 at 5:37 AM, Simon Hobson <span dir="ltr"><<a href="mailto:linux@thehobsons.co.uk" target="_blank">linux@thehobsons.co.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div class="im">Dick van der Sijs wrote:<br>
> However, the way I understand that rrdtool works is that with rrdgraph I cannot get max(counter1+counter2).<br>> That is, not unless I set up a third counter from the start in which I put the sum counter1+counter2.<br>
> The question is then if it is possible with rrdgraph alone, so without that third counter that I mentioned?<br>
> Note that I am not looking for max( max(counter1),max(counter2) ), but really for max(counter1+counter2).<br>
<br>
</div>You've already answered your own question - it's impossible once you've applied any consoilidation because the values you want simply do not exist.<br>
<br>
To get max( counter1 + counter2 ) then you **MUST** store counter1+counter2 prior to applying consolidation.<br>
<br>
I have a couple of things I'd like to do which have the same problem. Only I haven't yet figured out the best way to reliably and simply fetch values from multiple remote systems (and allowing for the possibility of one or more being down) so I can store the sum of the values.<br>
<br>
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