[rrd-users] Re: update old times

Alex van den Bogaerdt alex at ergens.op.HET.NET
Wed Apr 17 17:36:24 MEST 2002

Morgan Fruchtnicht wrote:

> This seems like an obvious question, but I can't find it 
> on the rrd web site - 
> rrd won't let me update a time that is prior to the most 
> recent update.  I want to do this to set occasional hiccups 
> in data collection to 0 so it doesn't goof up my numbers 
> when it's all said and done.  

That's right.  You cannot update old values.

> How does(can?) one do this?

What you can do is make an ascii dump of the database, edit that
dump and then restore it again.  You will have to alter each RRA

RTFM for "rrdtool dump" and "rrdtool restore" for the ascii dump.

Altering the values requires a little bit of knowledge of the RRD
format, which isn't hard to find.  In short:

RRA = n rows of n datasources;
each row describes (time-interval) to (time)

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