RRD File for one year

[CacHNW]

Hello, I need to collect exact data (without daily average, need 5 min average). I tried to do it like in this post (http://forums.cacti.net/viewtopic.php?f=6&t=9605), but if I try to export data to CSV I see data after one hour, not 5 minutes. But if I zoom to graph I see 5 minutes average. Can you help me please how to solve my problem? Thank you