[rrd-developers] Re: Restarting devices

[Tobias Oetiker]

Today you sent me mail regarding Re: [rrd-developers] Re: Restarting devices :

*> >rrdtool only comes up with NaN for an interval if more than Minimal required
*> >heartbeat seconds of the interval are UNKNOWN ... 
*> 
*> Tobi,
*> 
*> Can I request an option to ignore heartbeat when it set to 0 or -1?
*> Something like:
*> 287,289c287
*> <              rrd.ds_def[i].par[DS_mrhb_cnt].u_cnt >= interval &&
*> <              rrd.ds_def[i].par[DS_mrhb_cnt].u_cnt >0
*> <               ) {
*> ---
*> >              rrd.ds_def[i].par[DS_mrhb_cnt].u_cnt >= interval) {
*> 393,394c391
*> <                    > rrd.ds_def[i].par[DS_mrhb_cnt].u_cnt
*> <                    && rrd.ds_def[i].par[DS_mrhb_cnt].u_cnt > 0 ) ||
*> ---
*> >                    > rrd.ds_def[i].par[DS_mrhb_cnt].u_cnt) ||
*> 
*> I can understand for those data types related to delta time, it is
*> necessary to save guard the data by using heartbeat.  However, some 
*> absolute data such as CPU/memory usage, the right action is to round 
*> the timestamp upto the closest step, instead of losing data by NaN.  I 
*> don't think raising the heartbeat(what I do) is the answer.

ok think of this ... your server goes down and you are not able to collect
performance data for several hours ... what should rrdtool do (assuming you
normally collect every 5 minutes ...

cheers
tobi
*> 
*> Min
*> 
*> 

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