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I found that the rrd file will disappear automatically while poolling failed or there's no data been retrievaled for a period. I was expected that rrd file keep for a long time(maybe one year), thus i can see the graph of last year. I think there may have some options can help to prevent rrd file be deleted even snmp poolling failed or no data been retrievaled.
I'm worried. Cacti by no means deletes any rrd file on its own.
In fact, I've written a plugin to allow you to delete rrd files manually. So please make sure that nothing interfered on your system
Reinhard
