[rrd-users] Re: Q: How to fetch value from "start" to "end" in RRD/RRA

[Alex van den Bogaerdt]

Alex Lam wrote:
> 
> Q1: How can I obtain the start and end value in the RRD/RRA so that
>     I can dump all values in the rrd/rra during "start" to "end" time?

It is not too hard:  you have to understand that start and end are
not fixed values and thus are meaningless by themselves.

> Hope this can get the "start" and "end" value from the output
>  > /usr/local/rrdtool-1.0.25/bin/rrdtool fetch etc6p3.rrd AVERAGE
>             --start start+0s --end end-0s

start+0s is the same as start.  Therefore, my first comment still
applies...

> ERROR: the start time cannot be specified relative to itself

and rrdtool complains. 

>  > /usr/local/rrdtool-1.0.25/bin/rrdtool fetch etc6p3.rrd AVERAGE
>             --start end+0s --end start-0s
> ERROR: the start and end times cannot be specified relative to each other

Try using "now".  Now is a known point in time, "--start now-1d"
means ``1 day ago''.

"--start now-2d --end start+1d" is valid.

HTH
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