[rrd-users] Re: memory graphs

Serge Maandag serge.maandag at staff.zeelandnet.nl
Tue Oct 18 21:16:59 MEST 2005

> Hi guys,
> i'm here again...
> weel, i'm trying to build the memory graph, but some strange 
> problems are happen...
> first i create the rrd file:
> RRDs::create($RRDPATH."/system/memory.rrd",
>                          "--step=300",
>                          "DS:used:COUNTER:200:0:U",
>                          "DS:cached:COUNTER:200:0:U",

Your heartbeat is lower than your step.
So if you update every 300 seconds, you will be 100 seconds too 
late to keep the DS value valid.

Read up on step and heartbeat on the rrdtool website.


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