[rrd-users] Re: Peaks after reboots.

Alex van den Bogaerdt alex at ergens.op.het.net
Wed Jan 14 16:03:16 MET 2004

On Wed, Jan 14, 2004 at 03:14:55PM +0100, Bernard van de Koppel wrote:

> After reboot of monitored divices (routers and switches) I often get an peak 
> value reported via RRD tool, unaware of the reboot of the device. 
> Since i can easily test the sysuptime, I know when reboots have occured. 
> Is there a way to store specific values into the rrd database, folowed by the 
> real (first counter) value, after a reboot of an device??? 

Sure.  You know when the device was reboot.  You know the counter values
at that time.  You don't know what happened just before the reboot.


at boottime-1: enter U (unknown) into the RRD
at boottime:   enter 0 (zero) into the RRD
at <now>:      process as usual.

The boottime is known, or can be calculated from "now" - "uptime".

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