[rrd-users] something missing ..

[raptor]

i'm trying to understand rrdtool, but something is missing from the picture what could be the problem.. below is a simple session of mine ..
"gen" is  a simple script with wich i use to automate sample generation (see below for details)..
U see on fetch I get annoying results that has nothing to do with data entered...?!? why ?
The other interesting thing is that I generate the data in steps of 300sec, but on fetch i get step 1800sec ?! which probably is the second RRA 6 samples averaged.., doesnt seem to me like average in fetch !? but how I can get COUNTER data itself ?!
(I tried and set "gen" step to 1800, but again nothing, even worse ?, i know i should use step 300 just was curious)


================the session===============================
$ rrdtool create test.rrd --start 1058344000 --step 300 DS:test:COUNTER:600:0:U RRA:AVERAGE:0.5:1:24 RRA:AVERAGE:0.5:6:10
$ ./gen  1058344000
rrdtool update test.rrd 1058344300:87
rrdtool update test.rrd 1058344600:96
rrdtool update test.rrd 1058344900:46
rrdtool update test.rrd 1058345200:51
rrdtool update test.rrd 1058345500:48
rrdtool update test.rrd 1058345800:91
rrdtool update test.rrd 1058346100:50
rrdtool update test.rrd 1058346400:33
rrdtool update test.rrd 1058346700:66
rrdtool update test.rrd 1058347000:97
rrdtool update test.rrd 1058347300:62
rrdtool update test.rrd 1058347600:51
rrdtool update test.rrd 1058347900:21
rrdtool update test.rrd 1058348200:65
rrdtool update test.rrd 1058348500:17
rrdtool update test.rrd 1058348800:97
rrdtool update test.rrd 1058349100:71
rrdtool update test.rrd 1058349400:92
rrdtool update test.rrd 1058349700:54
rrdtool update test.rrd 1058350000:61
rrdtool update test.rrd 1058350300:9
rrdtool update test.rrd 1058350600:23
rrdtool update test.rrd 1058350900:4
rrdtool update test.rrd 1058351200:70
rrdtool update test.rrd 1058351500:64
rrdtool update test.rrd 1058351800:81
rrdtool update test.rrd 1058352100:1
rrdtool update test.rrd 1058352400:24
rrdtool update test.rrd 1058352700:62
rrdtool update test.rrd 1058353000:25

raptor at bugs rrd $ rrdtool fetch test.rrd AVERAGE -s 1058344000
                     test
 
1058342400: nan
1058344200: nan
1058346000: 6.3629145013e+06



===============the script==========================
#!/usr/bin/perl
unless ($ARGV[0])  { print "no time specified\n"; exit  }
for my $i ( 1 .. 30 ) {
    my $t= $ARGV[0] + (300 * $i);
    my $r = int(rand(100));
    my $cmd = qq{rrdtool update test.rrd $t:$r};
    print "$cmd\n";
    qx{$cmd};
}r

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