[rrd-developers] Re: Restarting devices

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Mon Feb 7 23:28:40 MET 2000

Min Qiu wrote:
> 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.

I would rather know that I was unable to monitor my cpu usage.  

Big difference:
a) I *know* that I missed a sample
b) I *think* I received the same value twice but I am *not sure*

Be smart, choose (a).

The reason that a device cannot reply in a timely fashion may just be
an overloaded cpu.  Sometimes this may result in a reboot (either an
operator initiated reboot or an automated recovery) and during the next
poll the cpu load will be normal again.  Doing it your way would just
copy this good value onto the missing ones...

 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
| work                                                         private |
| My employer is capable of speaking therefore I speak only for myself |

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