[rrd-users] Re: newbie to rrdtool ...need help

[Alex van den Bogaerdt]

On Thu, May 27, 2004 at 02:47:45PM +0000, Arnar Thorarinsson wrote:
> Hello

[snip - counting flights through airspace]

[snip - DS type ABSOLUTE]

> Enter some data:
> /usr/bin/rrdtool update /tmp/traffic.rrd 1083373200:8:8:0
> /usr/bin/rrdtool update /tmp/traffic.rrd 1083376800:4:3:1

four flights in the last (1083376800-1083373200) 3600 seconds.

> /usr/bin/rrdtool update /tmp/traffic.rrd 1083380400:14:14:0

fourteen flights in the last (1083380400-1083376800=) 3600 seconds

[and so on]

Sounds reasonable.

> and create the graph:
> /usr/bin/rrdtool graph /tmp/traffic.gif          \
>      --start 1083369600                          \
>      --end 1083452400                            \
>      --title="FDPS Traffic"                      \
>      --vertical-label="Flights per hour"         \
>      -h 400                                      \
>      -w 800                                      \
>      --step 3600                                 \
>      --no-minor                                  \
>      DEF:mytraffic1=traffic.rrd:Total:AVERAGE    \
>      DEF:mytraffic2=traffic.rrd:East:AVERAGE     \
>      DEF:mytraffic3=traffic.rrd:West:AVERAGE     \
>      AREA:mytraffic1#708090:"Total"              \
>      LINE3:mytraffic2#FF0000:"East"              \
>      LINE3:mytraffic3#0000FF:"West" 

This will graph flights per second.  RRDtool keeps <something> per second.

If you want <per hour>, you need to multiply your rates by 3600.

> Ok this work fine but the problem is that the X-scale of off both its
> value and the unit.

You probably ment to say Y-axis, right?  Try the following modifications:

1: between your last DEF and AREA, insert the following:

   CDEF:traffic1=mytraffic1,3600,*
   CDEF:traffic2=mytraffic2,3600,*
   CDEF:traffic3=mytraffic3,3600,*

2: Loose the "my" from AREA and both LINE3s

HTH
Alex
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