[rrd-users] how to input the old data with "update" parameter?

[JoeCen]

1、
I create a new "rrd" file :
/opt/rrdtool/bin/rrdtool create \
one.rrd \
--start `date -d '2005/04/01' +%s` \
--step 300  \
DS:test1:GAUGE:600:0:100 \
RRA:AVERAGE:0.5:1:600 \
RRA:AVERAGE:0.5:6:700 \
RRA:AVERAGE:0.5:24:775 \
RRA:AVERAGE:0.5:288:797 \
RRA:MAX:0.5:1:600 \
RRA:MAX:0.5:6:700 \
RRA:MAX:0.5:24:775 \
RRA:MAX:0.5:288:797

2、I want to input some old data between "2005/04/01" and now.
I write a script to do it:

time=`date -d '2005/04/01' +%s`
lasttime=`date +%s`
value=123

while [ $time -lt $lasttime ]
do
{
       echo "$time ##### $value #######" >> /rrd/log
       rrdtool update one.rrd $time:$value
       time=`expr $time + 300`
       value=`expr $value + 1`
}
done

3、I run the script and no error display.but when I used the "fetch"
parameter to saw the result.l found the result is "nan":

rrdtool fetch one.rrd AVERAGE

1113324000:  nan
1113327000:  nan
1113330000:  nan
1113333000:  nan
1113336000:  nan
1113339000:  nan
1113342000:  nan
1113345000:  nan
1113348000:  nan
1113351000:  nan
1113354000:  nan
1113357000:  nan
1113360000:  nan
1113363000:  nan

why？
Is there anything I miss?

Thanks for your help.
JOE

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