[rrd-users] [Fwd: Re: Re: Excluding UNKN or NAN from CDEF]

Stephan Harren sh at abovenet.de
Mon Sep 27 17:43:34 MEST 2004

 >Good suggestion but its result is not quite what I was looking for.

>This makes all unknowns = 0.0 (or in my case I tried 1.0 - which made 
>the graphs look far more successful than they should be) Again, the only 
>acceptable result would be to eliminate unknowns entirely.
Unknowns ARE ignored when calculating, so try not to use the "use 0 
instead of NaN"-Statements:

CDEF:ResponseSum=PREV,UN,0,PREV,IF,Response,+ CDEF:One=Response,-1,GT
AREA:Response#3399ff:"Response from Webserver"
HRULE:0.9#000000:"SLA 90 %\n"
LINE3:Uptime#FF0000:"UpTime below SLA"
LINE3:AboveSLA#00FF00:"Uptime Above SLA\n"
GPRINT:UptDisp:MAX:"Uptime Max %.2lf %%"
GPRINT:UptDisp:MIN:"Min %.2lf %%"
GPRINT:UptDisp:AVERAGE:"Mean %.2lf %%"
GPRINT:UptDisp:LAST:"Last %.2lf %%\n"
COMMENT:"Last Update: 09/27/2004 7:36:45 AM\r"

But I guess, this will probably also have some disadvantages, because 
calculating with NaNs can lead to strange effects. Giv it a try, but I'd 
also prefer to use the "cleaned" version.


Stephan Harren
Head of Engineering
AboveNet Deutschland GmbH
Phone +49 69 90554 153
Fax +49 69 90554 111
Cell +49 173 7011126

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