[rrd-users] Error: Different results for same data values.

Christian Volkmann CVolkmann at orga-systems.com
Fri Aug 19 10:48:04 MEST 2005

Due to another thread here I detected a strange graph
for the same values.

The script below should feeds the same values for
UNEXPECTED and STRANGE in test.rrd and test2.rrd.

test.rrd just contains a second data which is feed in

I see a different graph for "UNEXPECTED" and "STRANGE"
in 1.2.11 .

Best regards,



rrdtool create test.rrd --start 1100000200 -s 60 \
        DS:UNEXPECT:GAUGE:60:0:100 \
        DS:EXPECT:GAUGE:60:0:100 \

rrdtool create test2.rrd --start 1100000200 -s 60 \
        DS:STRANGE:GAUGE:60:0:100 \

rrdtool update test.rrd -t EXPECT   1100000220:0
rrdtool update test.rrd -t UNEXPECT 1100000240:0
rrdtool update test.rrd -t EXPECT   1100000280:20
rrdtool update test.rrd -t UNEXPECT 1100000300:20
rrdtool update test.rrd -t EXPECT   1100000340:0
rrdtool update test.rrd -t UNEXPECT 1100000360:0
rrdtool update test.rrd -t EXPECT   1100000400:0
rrdtool update test.rrd -t UNEXPECT 1100000420:0
rrdtool update test.rrd -t EXPECT   1100000460:80
rrdtool update test.rrd -t UNEXPECT 1100000480:80
rrdtool update test.rrd -t EXPECT   1100000520:0
rrdtool update test.rrd -t UNEXPECT 1100000540:0

rrdtool update test2.rrd -t STRANGE 1100000240:0
rrdtool update test2.rrd -t STRANGE 1100000300:20
rrdtool update test2.rrd -t STRANGE 1100000360:0
rrdtool update test2.rrd -t STRANGE 1100000420:0
rrdtool update test2.rrd -t STRANGE 1100000480:80
rrdtool update test2.rrd -t STRANGE 1100000540:0

rrdtool graph picture.gif --start 1100000200 \
        --end 1100000600 --step 60 -w 200 -h 200 \
        DEF:a=test.rrd:UNEXPECT:MAX \
        DEF:b=test.rrd:EXPECT:MAX \
        DEF:c=test2.rrd:STRANGE:MAX \
        LINE3:a#FF0000:unexpected \
        LINE2:b#00FF00:expected \
        LINE1:c#0000FF:'strange, should be like unexpected'

display picture.gif

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