[rrd-users] Fetch the time of the first entry

[Steve Shipway]

Look in the documentation for 'rrdtool first' and 'rrdtool lastupdate'.
http://oss.oetiker.ch/rrdtool/doc/rrdfirst.en.html
This returns the first (oldest) entry for a given RRA.
http://oss.oetiker.ch/rrdtool/doc/rrdlastupdate.en.html
This returns the last entry time and values
Note that 'rrdtool last' by contrast returns the time of the last update.

Steve

Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
s.shipway at auckland.ac.nz<mailto:s.shipway at auckland.ac.nz>
Ph: +64 9 373 7599 ext 86487

________________________________
From: rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch [rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] on behalf of Steven Sim [unixandme at outlook.com]
Sent: Tuesday, 1 July 2014 3:08 p.m.
To: rrd-users at lists.oetiker.ch
Subject: [rrd-users] Fetch the time of the first entry

Hello;

I'm being asked to write a scrip to append data to an rrd and plot daily, weekly and monthly graphs of said data.

I already have a script to create an rrd and write data to it.

To append, I'll simply bypass the 'creation' logic of my script and use a user specified rrd file.

But to plot daily, weekly and monthly, I need to know the start time of the first entry in the rrd file.

Is there a way to determine the time of the first entry of an rrd file?

Deepest Regards
Steven Sim

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