Current: Nan problems

plikadida · Joined: 13 Nov 2008 Posts: 5

Hi. Got cacti working from an old version with upgrade.
Using the latest cacti version, rrdtool 1.2.12 and SUSE SLES 10 SP2. All graphs do generate ok, the only problem is that I keep getting

Current: nan

in all graphs.... very strange because it correctly shows Average and Maximum values in the same graphs.

File permissions are OK, snmpwalk also OK.... Any ideas where is the problem? I found one thread were one guy had similar problem on Debian Etch and he performed upgrade and it was fixed.

plikadida · Joined: 13 Nov 2008 Posts: 5

It looks like the last value is always recorded: 'nan', even when the device fully functioning. Is this some kind of a bug for 1.2.12?

1226585160: 1.3288888889e+00
1226585220: 1.4583333333e+00
1226585280: 1.6403295669e+00
1226585340: 1.5449800871e+00
1226585400: 1.6169125683e+00
1226585460: 1.9694444444e+00
1226585520: 1.6961111111e+00
1226585580: 1.2255555556e+00
1226585640: 1.3083333333e+00
1226585700: 1.4050000000e+00
1226585760: 1.3144444444e+00
1226585820: 1.0277777778e+00
1226585880: 1.0394444444e+00
1226585940: 1.1688888889e+00
1226586000: 1.2000000000e+00
1226586060: 1.0338888889e+00
1226586120: 1.1111111111e+00
1226586180: 1.0094444444e+00
1226586240: nan

gandalf · Posted: Thu Nov 13, 2008 4:09 pm Post subject:

This is perfectly possible. 1.2.12 is quite old. Please try 1.2.27. 1.2.28 has a bug concerning font handling.
Reinhard

plikadida · Joined: 13 Nov 2008 Posts: 5

Thanks for your response. However, installed 1.2.27 and the same problem persists

After running polling with spine, last value gets nan however in next run the last value gets numbers (value) (see for example 1227081360 where in first example below it shows "nan", but after next polling interval it fills 1227081360 with "2.9444444444e-01")...

1227080880: 2.3888888889e-01
1227080940: 3.4791666667e-01
1227081000: 3.4791666667e-01
1227081060: 3.3062617702e-01
1227081120: 2.5477910531e-01
1227081180: 3.1876138434e-01
1227081240: 3.4722222222e-01
1227081300: 2.8055555556e-01
1227081360: nan
1227081420: nan

(after next run)

1227080880: 2.3888888889e-01
1227080940: 3.4791666667e-01
1227081000: 3.4791666667e-01
1227081060: 3.3062617702e-01
1227081120: 2.5477910531e-01
1227081180: 3.1876138434e-01
1227081240: 3.4722222222e-01
1227081300: 2.8055555556e-01
1227081360: 2.9444444444e-01
1227081420: nan

plikadida · Joined: 13 Nov 2008 Posts: 5

So when graphs are viewed from Cacti, the Average (last) value is displayed NaN in graphs

All other data is correctly displayed.

gandalf · Posted: Thu Nov 20, 2008 11:15 am Post subject:

This is a known "drawback" of rrdtool. Please complain at rrdtool-users mailing list

Reinhard