[rrd-users] confused

[Li, Charles]

I created a rrd with the following:
++++++++++++++++++++++++++++++++++++++++++++++
rrdtool create epic229_forms_processtime.rrd \
--start 1067944589 \
--step 1 \
DS:forms_processtime:GAUGE:1:U:U \
RRA:AVERAGE:0.5:1:2204
++++++++++++++++++++++++++++++++++++++++++++++

When I do:
rrdtool update epic229_forms_processtime.rrd 1067969500:0.5
rrdtool update epic229_forms_processtime.rrd 1067969501:0.5
rrdtool update epic229_forms_processtime.rrd 1067969502:0.5
rrdtool update epic229_forms_processtime.rrd 1067969503:0.5

and do:
rrdtool fetch epic229_forms_processtime.rrd AVERAGE -s 1067969500 -e
1067969503 -r 1

I get:
1067969500: 5.0000000000e-01
1067969501: 5.0000000000e-01
1067969502: 5.0000000000e-01
1067969503: 5.0000000000e-01

But when I go:
rrdtool fetch epic229_forms_processtime.rrd AVERAGE -s 1067969506 -e
1067969503 -r 1
rrdtool fetch epic229_forms_processtime.rrd AVERAGE -s 1067969508 -e
1067969503 -r 1
I get:
1067969506: 5.0000000000e-01
1067969507: nan
1067969508: nan
1067969509: nan
1067969510: nan

Why did I get nan on 1067969508?

Thanks
Charles

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