[rrd-users] Re: logging old data.... RRD update frequency....

[Daniel A. Murray]

Thanks,
I kinda thought that might be the case.... just hoped for some sort of
work-around...

Dan
----- Original Message -----
From: "Alex van den Bogaerdt" <alex at ergens.op.het.net>
To: <rrd-users at list.ee.ethz.ch>
Sent: Thursday, April 24, 2003 7:04 AM
Subject: [rrd-users] Re: logging old data.... RRD update frequency....


> On Thu, Apr 24, 2003 at 06:36:27AM -0400, Daniel A. Murray wrote:
>
> > The script that starts the process also checkes to see if the results
file
> > exists, and if so, parses it and then passes it to RRD with the start
and
> > elapsed time as parameters.
> >
> > While this generally works ok, on occasion a wayward process sometimes
takes
> > longer than 5 minutes, and occasionally as long as 48 hours.  The
problem is
> > how to accurately go back and log that data which, from an RRD
pespective
> > would have been missed.
>
> Nope, from an RRD perspective, the data is known to be unknown.  This is
> different from what you expect, it is a known fact that the update wasn't
> there while the next was.  The data isn't missing, the data is known to be
> unknown.
>
>
> > Any thoughts?  The only way I can think of is a brute force method of
> > exporting the entire RRD, inserting the data, then re-importing the
entire
> > RRD.  There has to be a better way.
>
> This is more difficult than you think.  It doesn't fit the way RRD works.
>
> Your numbers are normalized, then they are moved to each of the RRAs.  You
> will have to recalculate the input for these RRAs however you cannot do
this
> because the input isn't there anymore.
>
> If this doesn't make any sense at all for you I suggest that you read my
> stuff on rrdtool, available on faq.mrtg.org
>
> HTH
> Alex
>
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