[rrd-users] Newbie question about last_ds and value

Horsky, Laura lmgoodbu at uncc.edu
Tue Jul 15 17:22:47 CEST 2008

I am fairly new to troubleshooting rrd files, so please be patient with


I am trying to graph the memory usage of a device. I can successfully
capture the oid value, but I think it is in the wrong place in the rrd


What I am seeing is:



                <name> memory </name>

                <type> COUNTER </type>

                <minimal_heartbeat> 600 </minimal_heartbeat>

                <min> 0.0000000000e+00 </min>

                <max> 1.0000000000e+08 </max>


                <!-- PDP Status -->

                <last_ds> 260580 </last_ds>

                <value> 2.1045329206e+09 </value>

                <unknown_sec> 0 </unknown_sec>



The < last_ds> of 260580 is actual data from the oid, which I thought
would also be the "value". What am I doing wrong here? Where is the
<value> coming from?


This rrd file is being generated in Cacti if that helps and within Cacti
I have the following values set:

Data source = memory

Minimum value = 0

Maximum value = 100000000 (this is artificially high right now while I
figure out the value problem)

Data Source Type = Counter

Heartbeat = 600


Any help would be greatly appreciated.

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