I figured out the problem... There was too few data in the file and the graph offset time was too high... Thanks a lot for your help! -- View this message in context: http://rrd-mailinglists.937164.n2.nabble.com/RRDTOOL-and-custom-data-tp7581653p7581673.html Sent from the RRDtool Users Mailinglist mailing list archive at Nabble.com.