[rrd-users] Calculating availability (percent) from rrdtool fetch

Michael Heiming michael at heiming.de
Sun May 5 21:19:30 MEST 2002


need to measure availibility with mrtg/rrd, setup mrtg, running with 
logformat:rrdtool to measure system.sysUpTime.0.

Dividing (Timeticks) with 30000,it should give me 1 timetick = 5min 
since last reboot, as the .rrd(s) are updated every five minutes, that 
sounds (at least to me) reasonable. Sadly the .rrd automagically 
created by mrtg don't contain MIN values, should I setup some on my 
own (using rrdtool create <..>)? Will mrtg update them without any 

Or should I stick with the data I have, count those nan (assuming the 
target was down) and calculate the availability (percent for a given 
time) from here.

If someone has a hint/idea, or allready done something like this, it 
would be great to hear from you!

Thanks for reading

Michael Heiming

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