Hi, I have read http://wiki.openvz.org/Traffic_accounting_through_proc and I have tried using the following to create the RRD file: rrdtool create $RRDFILE --step 300 \ DS:ifOutOctets:COUNTER:1800:0:4294967295 \ RRA:AVERAGE:0.5:1:2016 \ RRA:HWPREDICT:1440:0.1:0.0035:288 When I tried to run the script, it gave the following error: ERROR: expected 1 data source readings (got 2) from N:692842110:837150828 Can someone please help me out with this? Regards, Eugenio Pacheco