Cacti

I added the rrd file but here is where I am running into trouble when adding the Internal Data Source Name how can I tell exactly what this is because when I turn on the preview this is what I get. ERROR: No DS called 'Test_Free_Commit' in 'd:/mrtg/test/logs/win2ksfs121_free_commit.rrd' Thanks --Todd

I have cacti installed on a Win2k Server and it is running ok. Now here is my problem. I have MRTG running every 5 mins creating rrd files now I would like to use cacti to graph the data. I tried adding a data source pointing to that rrd file but nothing happens. Graphs aren't showing up meaing blan...