[hobbit] strange graph behavior - random machines & graphs

[Josh Luthman]

Very cool, Gary.  Awesome to the max!

Thank you very much for sharing your experience and a fix!

Just for the record - when using this double check the rrdtool dir and the
user:group permissions - not everyone uses those same settings!

Again, thanks a lot!

On 12/5/07, Gary Baluha <gumby3203 at gmail.com> wrote:
>
> I wrote a script to clean up these bogus values.  Of course, if there are
> trend graphs where numbers large enough for NNNe+1NN to be valid, the script
> will have unexpected results.  To run the script, you need to "cd" into the
> directory with the rrd files to be fixed.
>
> On Dec 5, 2007 2:05 PM, Gary Baluha <gumby3203 at gmail.com> wrote:
>
> > cd hobbit_data_dir/host_machine
> > rrdtool dump clock.rrd > clock.xml
> >
> > I know any number that shows up greater than "e+1nn" is bogus, so I
> > search for "e+1".
> >
> > One of several bogus data lines:
> > <!-- 2007-11-26 19:00:00 EST / 1196121600 --> <row><v> 3.9551632477e+169</v></row>
> >
> > Same line, changed to NaN (repeat for all affected lines):
> > <!-- 2007-11-26 19:00:00 EST / 1196121600 --> <row><v> NaN </v></row>
> >
> > rrdtool restore clock.xml clock.rrd
> >
> >
> > On Dec 5, 2007 11:57 AM, Kern, Thomas <Thomas.Kern at hq.doe.gov > wrote:
> >
> > >  Could you give a short example of a bogus and a changed (NaN) entry,
> > > just in case that is also happening to some of my data files?
> > >
> > >
> > > /Thomas Kern
> > > /301-903-2211 (O)
> > > /301-905-6427 (M)
> > >
> > >
> > >  ------------------------------
> > > *From:* Gary Baluha [mailto:gumby3203 at gmail.com]
> > > *Sent:* Wednesday, December 05, 2007 11:53 AM
> > > *To:* hobbit at hswn.dk
> > > *Subject:* Re: [hobbit] strange graph behavior - random machines &
> > > graphs
> > >
> > > I am now completely convinced that the strange behavior of the graphs
> > > is due to some bad data getting inserted into the .rrd database files.  The
> > > bad data is always the same value: 5.1776682516e+170.  That's what the
> > > value looks like when you do an rrddump on the .rrd database file.
> > >
> > > I still have no idea where this value is coming from, but I have at
> > > least determined how to fix these graphs.  I'm working on a script to do
> > > this, but for now, I manually do an rrddump of the file, change all bogus
> > > values to NaN (basically, searching for "e+1", since none of the values I
> > > trend generally get that large, so I know these entries are just averaged
> > > values of correct data and the 5.17... number), and then do an
> > > rrdrestore from the modified xml file.
> > >
> > > It would be nice to determine where this problem is coming from,
> > > though.
> > >
> > >
> >
>
> To unsubscribe from the hobbit list, send an e-mail to
> hobbit-unsubscribe at hswn.dk
>
>
>


-- 
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373

Those who don't understand UNIX are condemned to reinvent it, poorly.
--- Henry Spencer
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.xymon.com/pipermail/xymon/attachments/20071205/6e4e078f/attachment.html>