<div dir="ltr"><div class="gmail_extra">Simon;</div><div class="gmail_extra"><br></div><div class="gmail_extra">Something is seriously wrong and I don't know what it is.</div><div class="gmail_extra"><br></div><div class="gmail_extra">
My Perl script parses the data file just fine.</div><div class="gmail_extra"><br></div><div class="gmail_extra">It plots just fine.</div><div class="gmail_extra"><br>The legends are correct</div><div class="gmail_extra">
<br>
</div><div class="gmail_extra">The dates are correct.</div><div class="gmail_extra"><br></div><div class="gmail_extra">BUT when I use rrdtool first <rrd database> in an attempt to get the time of the first entry, I get a Unix time stamp which is one entire month EARLIER than the first entry in the file.</div>
<div class="gmail_extra"><br></div><div class="gmail_extra">And each time I do update, rrdtool first <rrd_database> returns a DIFFERENT number.</div><div class="gmail_extra"><br></div><div class="gmail_extra">The rrd database is created with an RRA sufficient to contain an entire month with readings taking every 15 minutes (900 seconds).</div>
<div class="gmail_extra"><br></div><div class="gmail_extra">I would appreciate any suggestions.</div><div class="gmail_extra"><br></div><div class="gmail_extra">Deepest Regards<br>Steven Sim<br><br><div class="gmail_quote">
On Tue, Jul 1, 2014 at 8:23 PM, Simon Hobson <span dir="ltr"><<a href="mailto:linux@thehobsons.co.uk" target="_blank">linux@thehobsons.co.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Steven Sim <<a href="mailto:unixandme@outlook.com">unixandme@outlook.com</a>> wrote:<br>
<br>
> my rrdtool first <rrdfile> command keeps returning different timing after each rrdtool update.<br>
><br>
> Why is that so?<br>
><br>
> Shouldn't it ALWAYS return the Unix time stamp for the first entry?<br>
<br>
It's not a function I've used ...<br>
<br>
The docs say it should return the first value entered. Once you've "filled" a data set, then it's going to give you the timestamp of the oldest available value - I'm not sure what it gives you for an RRD file that hasn't been "filled".<br>
Here I'm using the term "filled" to mean you done enough updates that the whose database (or at least data series) has been filled with data and you are now losing older data to make way for the new data.<br>
<br>
Have you looked at how the value is changing ? Does it by any chance advance at the same rate as the timestamp of your updates ?<br>
<br>
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