[rrd-users] One data point missed causes 2 Unknown entries in RR Archive

[Prasanna Kumar Natarajan]

I create an RRD started at 1095606600, with step size 5 mins, & DST GAUGE, RRA has 12 rows, spans for one hour. No Consolidation is done as RRA Step size is 1.
 
[pnatarajan2 at trainer rrdtool]$ rrdtool create temp.rrd -b 1095606600 -s 300 \
> DS:a:GAUGE:300:U:U \
> RRA:AVERAGE:0.5:1:12
Now I update values periodically from 1095606900, just skip 2 values at times 1095607500 & 1095608400.
 
[pnatarajan2 at trainer rrdtool]$ rrdupdate temp.rrd 1095606900:8 \
> 1095607200:9 \
> 1095607800:10 \
> 1095608100:11 \
> 1095608700:12 \
> 1095609000:13
 
But when data is fetched, I see that the update for 1095607800 & 1095608700 has not taken place.
 
[pnatarajan2 at trainer rrdtool]$ rrdtool fetch temp.rrd AVERAGE \
> -s 1095606600 -e 1095609300
timestamp    a
 
1095606600:  nan
1095606900:  8.0000000000e+00
1095607200:  9.0000000000e+00
1095607500:  nan
1095607800:  nan
1095608100:  1.1000000000e+01
1095608400:  nan
1095608700:  nan
1095609000:  1.3000000000e+01
1095609300:  nan
[pnatarajan2 at trainer rrdtool]$ 

 Why does this happen? How do I get it fixed?


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