[rrd-users] Time Shift on Trend Graph

[Alex van den Bogaerdt]

----- Original Message ----- 
From: "Chris Mason" <chris at netnix.org>
To: <rrd-users at lists.oetiker.ch>
Sent: Monday, July 01, 2013 12:27 PM
Subject: Re: [rrd-users] Time Shift on Trend Graph


> Hi,
>
> I am assuming "rrdtool last" returns the actual last time because when you
> add new data to the RRD, it rotates the RRD and the stuff that was
> previously at the beginning interval is pushed out - to always maintain 
> the
> same length and size of an RRD - you are always adding to the end?
>
> I am starting to conclude, after getting the feeling that I am talking to
> myself, that I can't obtain the point in my RRD when I first entered data?
> Would it not be the first non-unknown value in the data source and can I
> obtain this easily to use this to determine the start time of my graph?

Never tried it myself, but in the doc I find: rrdfirst Return the date of 
the first data sample in an RRA within an RRD

And if that does not work, You could try to use a VDEF function for this. 
Not surprisingly you would need "FIRST" again. Print it's time component.

If these two are not what you're after, then you will need to rephrase your 
problem.