[mrtg] statistics during server halted

[Dan]

srtt.be - Michel Lombart wrote:

 > After the reboot and a full functionnal check, I've looked at the MRTG
 > statistics. I was surprised to see that values during the interruption
 > was not null but seems to be the same as the last measure juste before
 > the halt. Values was constant during the whole period.
 >
 > It's not a real issue but I wonder to know why and if there is a smart
 > solution to avoid these false data ?

This is by desigh - you can use the option: unknaszero (see 
http://oss.oetiker.ch/mrtg/doc/mrtg-reference.en.html) to make it all zero.

e.g. Options[router]: growright, bits, unknaszero

If you use RRD as the back end you also get zero values - if you use 
Routers2CGI as your front end it grays it out which makes it really 
obvious too.

Dan.