[rrd-users] New, need some clarification on creating and inputting

Joseph Oaks joaks at isomedia.com
Tue May 25 23:17:20 MEST 2004

Ok, so I got this cool tool and now I need to learn how to use it :)

First off let me state that I have read the doc's and thats what has
gotten me this far.

I'm not a coder, I don't think like a coder, but I want to learn. So
with that established that I'm an idiot I can proceed :)

I have a need to graph the iostat on a number of boxes. So I have 
create a rrd file to track 4 of the fields, rkB/s, wkB/s, await, 
and %util. I understand that I will need a seperate rrd file for
each partition, /dev/hda, /dev/hda1, etc... So this is what I came
up with...

rrdtool create \
localhost_iostat_hda.rrd \
--step 300 \
DS:hda_read:GAUGE:600:0:U \
DS:hda_write:GAUGE:600:0:U \
DS:hda_await:GAUGE:600:0:U \
DS:hda_percent:GAUGE:600:0:U \
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 \

Now in a simple shell script I have the following, since I will be
inputting the device manually for now, later it will be automatic
to query the fstab file and get the list of partitions from there
to feed into the iostat and then into the rrdtool.

iostat -d -x 2 2| grep $1\ | awk '{print $8":"$9":"$13":"$14}'

When I have attempted to add these four entries manually it seems
to work just fine doing...
rrdtool update localhost_iostat_hda.rrd N:62.07:36.09:27.14:101.02

Yet when I try to fetch I get the following...
[root at joaks scripts]# rrdtool fetch localhost_iostat_hda.rrd AVERAGE -r 300 -s -1h
                       hda_read            hda_write            hda_await    hda_percent
1085515200: nan nan nan nan
1085515500: nan nan nan nan
1085515800: nan nan nan nan
1085516100: nan nan nan nan
1085516400: nan nan nan nan
1085516700: nan nan nan nan
1085517000: nan nan nan nan
1085517300: nan nan nan nan
1085517600: nan nan nan nan
1085517900: nan nan nan nan
1085518200: nan nan nan nan
1085518500: nan nan nan nan
1085518800: nan nan nan nan
1085519100: nan nan nan nan

What am I doing wrong? Am I doing anything right? As for the rrd
I want to keep a 5 min log for 6 hours, 15 min log for 12 hours,
a 30 min log for 24 hours but I no I don't have my numbers correct
in the create section but I can always redo that.

Thanks, and sorry for the questions.


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