[rrd-users] rrdupdate

[Simon Hobson]

At 13:45 +0400 25/12/07, rihad wrote:
>Hi, how can I use rrdupdate to zero out certain older values stored by
>mrtg (Interval: 5 minutes) ?
>
># rrdtool update 10.11.12.13.rrd 1198568400:U:U
>ERROR: illegal attempt to update using time 1198568400 when last update
>time is 1198568934 (minimum one second step)
>#
>
>No matter which older value I try I get that message.

You can't<period>

If you REALLY need to fiddle with your historical data, then you will 
need to export the data, alter the values in the XML file, then 
import that into a new database.