Unfortunately, I am seeing sporadic NaNs in my RRD and gaps in my graphs.
From cacti.log:
10/16/2015 01:35:09 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /data/www/cacti/rra/freemem_35560.rrd --template UsedMem:FreeMem:TotalMem 1445016909:3409756000:12929944000:16339700000
10/16/2015 01:40:09 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /data/www/cacti/rra/freemem_35560.rrd --template UsedMem:FreeMem:TotalMem 1445017209:3409756000:12929944000:16339700000
10/16/2015 01:45:15 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /data/www/cacti/rra/freemem_35560.rrd --template UsedMem:FreeMem:TotalMem 1445017515:3409756000:12929944000:16339700000
10/16/2015 01:50:09 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /data/www/cacti/rra/freemem_35560.rrd --template UsedMem:FreeMem:TotalMem 1445017809:3409756000:12929944000:16339700000
10/16/2015 01:55:09 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /data/www/cacti/rra/freemem_35560.rrd --template UsedMem:FreeMem:TotalMem 1445018109:3409756000:12929944000:16339700000
10/16/2015 02:00:10 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /data/www/cacti/rra/freemem_35560.rrd --template UsedMem:FreeMem:TotalMem 1445018410:3409756000:12929944000:16339700000
10/16/2015 02:05:09 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /data/www/cacti/rra/freemem_35560.rrd --template UsedMem:FreeMem:TotalMem 1445018709:3409756000:12929944000:16339700000
10/16/2015 02:10:09 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /data/www/cacti/rra/freemem_35560.rrd --template UsedMem:FreeMem:TotalMem 1445019009:3409756000:12929944000:16339700000
10/16/2015 02:15:29 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /data/www/cacti/rra/freemem_35560.rrd --template UsedMem:FreeMem:TotalMem 1445019329:3409756000:12929944000:16339700000
10/16/2015 02:20:11 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /data/www/cacti/rra/freemem_35560.rrd --template UsedMem:FreeMem:TotalMem 1445019611:3409756000:12929944000:16339700000
10/16/2015 02:25:13 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /data/www/cacti/rra/freemem_35560.rrd --template UsedMem:FreeMem:TotalMem 1445019911:3409756000:12929944000:16339700000
10/16/2015 02:30:14 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /data/www/cacti/rra/freemem_35560.rrd --template UsedMem:FreeMem:TotalMem 1445020213:3409756000:12929944000:16339700000
From the RRD:
rrdtool fetch /data/www/cacti/rra/freemem_35560.rrd AVERAGE
1445015100: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445015400: -nan -nan -nan
1445015700: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445016000: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445016300: -nan -nan -nan
1445016600: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445016900: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445017200: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445017500: -nan -nan -nan
1445017800: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445018100: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445018400: -nan -nan -nan
1445018700: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445019000: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445019300: -nan -nan -nan
1445019600: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445019900: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445020200: -nan -nan -nan
1445020500: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445020800: 3.4097560000e+09 1.2929944000e+10 1.6339700000e+10
1445021100: -nan -nan -nan
So of course, my graphs look like this:
I hope someone can provide some advice on why this is happening. Thank you.