[rrd-users] changing system ti

Simon Hobson linux at thehobsons.co.uk
Mon Sep 1 15:40:30 CEST 2008

Jack Tavares wrote:

>When the system time changes backwards,

That is your problem

>  and I do an rrd update I get
>Error illegal attempt to
>update using time 1216080241 when last update time is 1216088161 (minimum one
>second step)
>I am specifying the update time in the update command.
>will using -N instead of a timestamp eliminate this issue?


>If not, what do other people do in this case?

The rather unhelpful answer is "don't start from here" ! Your system 
time should not change backwards, and the simple answer is to keep 
the time accurate (NTP is good for this).

By far the easiest way to deal with it is just wait the 2.2 hours you 
set the clock back by and it will recover on it's own - BUT you will 
effectively lose 2.2 hours of data. If you REALLY need the data then 
you'll have to export the entire RRD database, modify the data in it, 
then import it into a new database.

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