[rrd-users] graph resolution question

Hi,
I need to collect some data on 60 seconds interval, and I have created
my rrd files using this syntax;

rrdtool create --start now-86400 --step 60 DS:val:COUNTER:120:0:U
RRA:AVERAGE:0.5:1:1440 // 24 hour of 1 min data
RRA:AVERAGE:0.5:30:336 // 1 week of 30 min avg.
RRA:AVERAGE:0.5:360:120 // 1 month of 6 hour avg.
RRA:AVERAGE:0.5:1440:2190 // 1 year of 24 hour avg.
RRA:LAST:0.5:1:1440
RRA:LAST:0.5:30:336
RRA:LAST:0.5:360:120
RRA:LAST:0.5:1440:2190
RRA:MIN:0.5:1:1440
RRA:MIN:0.5:30:336
RRA:MIN:0.5:360:120
RRA:MIN:0.5:1440:2190
RRA:MAX:0.5:1:1440
RRA:MAX:0.5:30:336
RRA:MAX:0.5:360:120
RRA:MAX:0.5:1440:2190

when i create graphs , my monthly graph appears blocky, sometimes daily
graph too.

what makes graphs appear 'blocky' ?
is my rrdcreate syntax correct ?

thanks,
flamur

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