[rrd-users] Re: Problems with Counters after reboot of device

[Tobias Oetiker]

Today you sent me mail regarding Re: [rrd-users] Re: Problems with Counters...:

*> > the the MIN and MAX properties on all Data sources ... or use
*> > DERIVE instead of counter and set the MIN property of the DS to 0
*> > this will ignore all cases where the counter is smaller as the
*> > previous reading
*> 
*> Tobi:
*> 
*> There has been heated discussion about this on the Cricket list
*> recently, as to which of these options would be better, mainly for
*> dealing with the case where counters are being cleared manually by an
*> operator, or are otherwise being cleared without indication of a device
*> reboot.
*> 
*> Do you have an opinion, with regards to oids such as InOctets which can
*> not meaningfully be negative?

the DERIVE aproach works quite well but you will get the occasional
Unknown ... modern SNMP devices also support a per interface uptime
counter ... which gets reset when the interface is reset ... 

cheers
tobi

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