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In My Cacti and configured the remote host for disk monitor and its showing the value in Data Query but when i am trying to graph the same its showing value nan in graph please help me
Well, this looks good. So you're using the Available Disk Space Template. From other posts I know that there was a bug with that script. So you should get the latest version of this script, I suppose from svn (Browse SVN branch, see main cacti website)
Reinhard