[rrd-users] Odd ds graphing problem

[Marc Powell]

Hey guys!

I'm a long time user of RRDTool but new to the list so please excuse me
if I pull a faux-pas. I've looked through the last few months of
archives and haven't had any luck searching via google, etc. I've been
using 1.0.33 for a number of years now and discovered a bizarre graphing
problem where the 4th datasource, and only the 4th, is not being graphed
when specifying 4 or more DS's on a single graph. This problem is
persistent with 1.0.49. Because of this fact I believe the problem is
mine but I am at a loss to discover what I'm doing wrong. Using an rrd
file generated by cricket as an example --

/usr/local/rrdtool-1.0.49/bin/rrdtool graph test.png -a PNG -r -u 10
--base 1000 --start -151200 --vertical-label "Time in Seconds" --width
500 --height 200
DEF:ds0=/usr/local/cricket/cricket-config/../cricket-data//http-performa
nce/http-network-latency-cartoon.rrd:ds0:AVERAGE
DEF:ds1=/usr/local/cricket/cricket-config/../cricket-data//http-performa
nce/http-network-latency-cartoon.rrd:ds1:AVERAGE
DEF:ds2=/usr/local/cricket/cricket-config/../cricket-data//http-performa
nce/http-network-latency-cartoon.rrd:ds2:AVERAGE
DEF:ds3=/usr/local/cricket/cricket-config/../cricket-data//http-performa
nce/http-network-latency-cartoon.rrd:ds3:AVERAGE LINE1:ds0#00cc00:"Time
to First Byte" LINE1:ds1#0000ff:Davidson LINE1:ds2#ff0000:Knox
LINE1:ds3#:Shelby VRULE:1094619600#ff0000: VRULE:1094533200#ff0000:

Generates: http://www.connecten.org/test.png

/usr/local/rrdtool-1.0.49/bin/rrdtool graph test1.png -a PNG -r -u 10
--base 1000 --start -151200 --vertical-label "Time in Seconds" --width
500 --height 200
DEF:ds0=/usr/local/cricket/cricket-config/../cricket-data//http-performa
nce/http-network-latency-cartoon.rrd:ds1:AVERAGE
DEF:ds1=/usr/local/cricket/cricket-config/../cricket-data//http-performa
nce/http-network-latency-cartoon.rrd:ds2:AVERAGE
DEF:ds2=/usr/local/cricket/cricket-config/../cricket-data//http-performa
nce/http-network-latency-cartoon.rrd:ds3:AVERAGE
DEF:ds3=/usr/local/cricket/cricket-config/../cricket-data//http-performa
nce/http-network-latency-cartoon.rrd:ds0:AVERAGE
LINE1:ds0#00cc00:Davidson LINE1:ds1#0000ff:Knox LINE1:ds2#ff0000:Shelby
LINE1:ds3#:"Time to First Byte" VRULE:1094446800#ff0000:
VRULE:1093842000#ff0000:

Generates http://www.connecten.org/test1.png

As you can see, by simply changing the order of the arguments, the
missing item is graphed, but the 4th in the list is still missing. I
have another graph of spamassassin statistics that contains 15 items and
it is exhibiting the same behavior. No matter what order I define them
in, the 4th is always missing. Is there something obvious that I'm
missing? Is there more information that would be useful in diagnosing?

Thanks for all your help in advance!

--
Marc

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