[rrd-users] Re: Problem on update

[Chris Raymond]

Alex, 

Yes, you are misreading my problem.  You jumped to a conclusion
about what I was trying to say.  I understand the function of
heartbeat and xff, I just mentioned them to show that I had tried
some changes to work around this issue, instead of jumping to 
conclusions.

As I see it, RRDtool is inserting BOGUS DATA.  In the example given,
there is one real data point to insert, repeat, one.  It occurs at
time 957481200.  This is on a 3600 second time update interval, but
there were no data available for the 4 update intervals immediately
preceding this time.  What RRDtool inserted into the DB was five 
points, four of them copies.  The ds-type is GAUGE, the number of 
points is set to one, so from my reading of the documentation,
the data should go into the RRDtool DB exactly as sent.  The RRDtool
DB should not, repeat not, have 4 entries for data that never existed.
If you look below, or at the original post, you will see 4 entries
for data that do not exist, and never existed.  Thus RRDtool is
storing data that represent a false picture of reality.

rrdtool fetch UNEP-Peking.rrd LAST -s "20000504 12:00" -e "s+8h"
                      hop       pktloss           rtt       thruput

 957456000: 2.7000000000e+01 0.0000000000e+00 1.0030000000e+03 4.7000000000e+01
 957459600: 2.7000000000e+01 0.0000000000e+00 9.0100000000e+02 6.1000000000e+01
 957463200: 2.7000000000e+01 0.0000000000e+00 9.2200000000e+02 6.6000000000e+01
 957466800: 2.7000000000e+01 0.0000000000e+00 8.9000000000e+02 8.1000000000e+01
 957470400: 2.7000000000e+01 0.0000000000e+00 8.9000000000e+02 8.1000000000e+01
 957474000: 2.7000000000e+01 0.0000000000e+00 8.9000000000e+02 8.1000000000e+01
 957477600: 2.7000000000e+01 0.0000000000e+00 8.9000000000e+02 8.1000000000e+01
 957481200: 2.7000000000e+01 0.0000000000e+00 8.9000000000e+02 8.1000000000e+01
 957484800: NaN NaN NaN NaN

I hope I've now made what I regard as a problem clear.  

Thanks,
Chris R.

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