[rrd-developers] Re: Restarting devices

[Min Qiu]

What happen if the server is up but you have a slow net or a slow
collector? Here is a live sample.  I had a program do pings and 
give me rtt results.  Normally it can finish a list of task within 
5 minutes.  It will switch to 10 minutes interval or even 15 minutes 
interval if things are slow.  Now since all my data are out of 
heartbeat range, I end up have no data at all.

I think we ought to separate the heartbeat requirement baseed on 
data type.  Yes, it makes no sense to continue the normal calculation 
on the COUNTER after a few hours black out.

Min

In message <Pine.GSO.4.21.0002072040520.23339-100000 at engelberg.ee.ethz.ch>, Tob
ias Oetiker writes:
>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 requir
>ed
>*> >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
>*> 
>*> 
>
>-- 
> ______    __   _
>/_  __/_  / /  (_) Oetiker, Timelord & SysMgr @ EE-Dept ETH-Zurich
> / // _ \/ _ \/ / TEL: +41(0)1-6325286  FAX:...1517  ICQ: 10419518 
>/_/ \.__/_.__/_/ oetiker at ee.ethz.ch http://ee-staff.ethz.ch/~oetiker
>
>--
>Unsubscribe mailto:rrd-developers-request at list.ee.ethz.ch?subject=unsubscribe
>Help        mailto:rrd-developers-request at list.ee.ethz.ch?subject=help
>Archive     http://www.ee.ethz.ch/~slist/rrd-developers
>


--
Unsubscribe mailto:rrd-developers-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:rrd-developers-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/rrd-developers